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Finding the Fourth Proportional to 1,040.66, 1,561.59 and 747.84

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Solution

The fourth proportional to 1,040.66, 1,561.59 and 747.84 is: 1,122.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.66 : 1,561.59 = 747.84 : x
  2. Step 2: Convert to fraction form
    1,040.66/1,561.59 = 747.84/x
  3. Step 3: Cross multiply
    1,040.66x = 1,561.59 × 747.84
  4. Step 4: Simplify right side
    1,040.66x = 1,167,819.47
  5. Step 5: Solve for x
    x = 1,167,819.47/1,040.66
  6. Step 6: Final answer
    x = 1,122.20

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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.