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Finding the Fourth Proportional to 1,137.60, 1,706.70 and 521.76

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Solution

The fourth proportional to 1,137.60, 1,706.70 and 521.76 is: 782.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.60 : 1,706.70 = 521.76 : x
  2. Step 2: Convert to fraction form
    1,137.60/1,706.70 = 521.76/x
  3. Step 3: Cross multiply
    1,137.60x = 1,706.70 × 521.76
  4. Step 4: Simplify right side
    1,137.60x = 890,487.79
  5. Step 5: Solve for x
    x = 890,487.79/1,137.60
  6. Step 6: Final answer
    x = 782.78

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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.