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Finding the Fourth Proportional to 1,089.81, 1,503.33 and 690.75

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Solution

The fourth proportional to 1,089.81, 1,503.33 and 690.75 is: 952.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.81 : 1,503.33 = 690.75 : x
  2. Step 2: Convert to fraction form
    1,089.81/1,503.33 = 690.75/x
  3. Step 3: Cross multiply
    1,089.81x = 1,503.33 × 690.75
  4. Step 4: Simplify right side
    1,089.81x = 1,038,425.20
  5. Step 5: Solve for x
    x = 1,038,425.20/1,089.81
  6. Step 6: Final answer
    x = 952.85

Related Problems

Find fourth proportional to 544.91, 751.67 and 345.38
Half scale
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Double scale
Find fourth proportional to 1,090.81, 1,504.71 and 691.75
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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.