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Finding the Fourth Proportional to 474.98, 711.31 and 392.21

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Solution

The fourth proportional to 474.98, 711.31 and 392.21 is: 587.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.98 : 711.31 = 392.21 : x
  2. Step 2: Convert to fraction form
    474.98/711.31 = 392.21/x
  3. Step 3: Cross multiply
    474.98x = 711.31 × 392.21
  4. Step 4: Simplify right side
    474.98x = 278,980.66
  5. Step 5: Solve for x
    x = 278,980.66/474.98
  6. Step 6: Final answer
    x = 587.35

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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.