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Finding the Fourth Proportional to 557.80, 836.70 and 392.20

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Solution

The fourth proportional to 557.80, 836.70 and 392.20 is: 588.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.80 : 836.70 = 392.20 : x
  2. Step 2: Convert to fraction form
    557.80/836.70 = 392.20/x
  3. Step 3: Cross multiply
    557.80x = 836.70 × 392.20
  4. Step 4: Simplify right side
    557.80x = 328,153.74
  5. Step 5: Solve for x
    x = 328,153.74/557.80
  6. Step 6: Final answer
    x = 588.30

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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.