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Finding the Fourth Proportional to 476.47, 715.52 and 285.31

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Solution

The fourth proportional to 476.47, 715.52 and 285.31 is: 428.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.47 : 715.52 = 285.31 : x
  2. Step 2: Convert to fraction form
    476.47/715.52 = 285.31/x
  3. Step 3: Cross multiply
    476.47x = 715.52 × 285.31
  4. Step 4: Simplify right side
    476.47x = 204,145.01
  5. Step 5: Solve for x
    x = 204,145.01/476.47
  6. Step 6: Final answer
    x = 428.45

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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.