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Finding the Fourth Proportional to 1,274.76, 1,759.02 and 715.20

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Solution

The fourth proportional to 1,274.76, 1,759.02 and 715.20 is: 986.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.76 : 1,759.02 = 715.20 : x
  2. Step 2: Convert to fraction form
    1,274.76/1,759.02 = 715.20/x
  3. Step 3: Cross multiply
    1,274.76x = 1,759.02 × 715.20
  4. Step 4: Simplify right side
    1,274.76x = 1,258,051.10
  5. Step 5: Solve for x
    x = 1,258,051.10/1,274.76
  6. Step 6: Final answer
    x = 986.89

Related Problems

Find fourth proportional to 637.38, 879.51 and 357.60
Half scale
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Double scale
Find fourth proportional to 1,275.76, 1,760.40 and 716.20
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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.