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Finding the Fourth Proportional to 715.78, 1,071.60 and 495.70

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Solution

The fourth proportional to 715.78, 1,071.60 and 495.70 is: 742.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.78 : 1,071.60 = 495.70 : x
  2. Step 2: Convert to fraction form
    715.78/1,071.60 = 495.70/x
  3. Step 3: Cross multiply
    715.78x = 1,071.60 × 495.70
  4. Step 4: Simplify right side
    715.78x = 531,192.12
  5. Step 5: Solve for x
    x = 531,192.12/715.78
  6. Step 6: Final answer
    x = 742.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.