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Finding the Fourth Proportional to 1,557.90, 2,337.21 and 517.86

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Solution

The fourth proportional to 1,557.90, 2,337.21 and 517.86 is: 776.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.90 : 2,337.21 = 517.86 : x
  2. Step 2: Convert to fraction form
    1,557.90/2,337.21 = 517.86/x
  3. Step 3: Cross multiply
    1,557.90x = 2,337.21 × 517.86
  4. Step 4: Simplify right side
    1,557.90x = 1,210,347.57
  5. Step 5: Solve for x
    x = 1,210,347.57/1,557.90
  6. Step 6: Final answer
    x = 776.91

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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.