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Finding the Fourth Proportional to 456.91, 684.18 and 415.28

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Solution

The fourth proportional to 456.91, 684.18 and 415.28 is: 621.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.91 : 684.18 = 415.28 : x
  2. Step 2: Convert to fraction form
    456.91/684.18 = 415.28/x
  3. Step 3: Cross multiply
    456.91x = 684.18 × 415.28
  4. Step 4: Simplify right side
    456.91x = 284,127.98
  5. Step 5: Solve for x
    x = 284,127.98/456.91
  6. Step 6: Final answer
    x = 621.85

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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.