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Finding the Fourth Proportional to 715.08, 987.20 and 495.24

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Solution

The fourth proportional to 715.08, 987.20 and 495.24 is: 683.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.08 : 987.20 = 495.24 : x
  2. Step 2: Convert to fraction form
    715.08/987.20 = 495.24/x
  3. Step 3: Cross multiply
    715.08x = 987.20 × 495.24
  4. Step 4: Simplify right side
    715.08x = 488,900.93
  5. Step 5: Solve for x
    x = 488,900.93/715.08
  6. Step 6: Final answer
    x = 683.70

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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.