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Finding the Fourth Proportional to 915.14, 1,263.58 and 718.32

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Solution

The fourth proportional to 915.14, 1,263.58 and 718.32 is: 991.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.14 : 1,263.58 = 718.32 : x
  2. Step 2: Convert to fraction form
    915.14/1,263.58 = 718.32/x
  3. Step 3: Cross multiply
    915.14x = 1,263.58 × 718.32
  4. Step 4: Simplify right side
    915.14x = 907,654.79
  5. Step 5: Solve for x
    x = 907,654.79/915.14
  6. Step 6: Final answer
    x = 991.82

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Double scale
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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.