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Finding the Fourth Proportional to 557.60, 836.40 and 521.15

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Solution

The fourth proportional to 557.60, 836.40 and 521.15 is: 781.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.60 : 836.40 = 521.15 : x
  2. Step 2: Convert to fraction form
    557.60/836.40 = 521.15/x
  3. Step 3: Cross multiply
    557.60x = 836.40 × 521.15
  4. Step 4: Simplify right side
    557.60x = 435,889.86
  5. Step 5: Solve for x
    x = 435,889.86/557.60
  6. Step 6: Final answer
    x = 781.73

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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.