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Finding the Fourth Proportional to 1,089.48, 1,503.60 and 716.76

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Solution

The fourth proportional to 1,089.48, 1,503.60 and 716.76 is: 989.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.48 : 1,503.60 = 716.76 : x
  2. Step 2: Convert to fraction form
    1,089.48/1,503.60 = 716.76/x
  3. Step 3: Cross multiply
    1,089.48x = 1,503.60 × 716.76
  4. Step 4: Simplify right side
    1,089.48x = 1,077,720.34
  5. Step 5: Solve for x
    x = 1,077,720.34/1,089.48
  6. Step 6: Final answer
    x = 989.21

Related Problems

Find fourth proportional to 544.74, 751.80 and 358.38
Half scale
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Double scale
Find fourth proportional to 1,090.48, 1,504.98 and 717.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.