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Finding the Fourth Proportional to 1,137.40, 1,706.76 and 747.88

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Solution

The fourth proportional to 1,137.40, 1,706.76 and 747.88 is: 1,122.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.40 : 1,706.76 = 747.88 : x
  2. Step 2: Convert to fraction form
    1,137.40/1,706.76 = 747.88/x
  3. Step 3: Cross multiply
    1,137.40x = 1,706.76 × 747.88
  4. Step 4: Simplify right side
    1,137.40x = 1,276,451.67
  5. Step 5: Solve for x
    x = 1,276,451.67/1,137.40
  6. Step 6: Final answer
    x = 1,122.25

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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.