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Finding the Fourth Proportional to 477.12, 714.47 and 399.88

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Solution

The fourth proportional to 477.12, 714.47 and 399.88 is: 598.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.12 : 714.47 = 399.88 : x
  2. Step 2: Convert to fraction form
    477.12/714.47 = 399.88/x
  3. Step 3: Cross multiply
    477.12x = 714.47 × 399.88
  4. Step 4: Simplify right side
    477.12x = 285,702.26
  5. Step 5: Solve for x
    x = 285,702.26/477.12
  6. Step 6: Final answer
    x = 598.81

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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.