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Finding the Fourth Proportional to 474.39, 711.72 and 392.99

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Solution

The fourth proportional to 474.39, 711.72 and 392.99 is: 589.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.39 : 711.72 = 392.99 : x
  2. Step 2: Convert to fraction form
    474.39/711.72 = 392.99/x
  3. Step 3: Cross multiply
    474.39x = 711.72 × 392.99
  4. Step 4: Simplify right side
    474.39x = 279,695.28
  5. Step 5: Solve for x
    x = 279,695.28/474.39
  6. Step 6: Final answer
    x = 589.59

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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.