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Finding the Fourth Proportional to 1,040.76, 1,561.10 and 424.30

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Solution

The fourth proportional to 1,040.76, 1,561.10 and 424.30 is: 636.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.76 : 1,561.10 = 424.30 : x
  2. Step 2: Convert to fraction form
    1,040.76/1,561.10 = 424.30/x
  3. Step 3: Cross multiply
    1,040.76x = 1,561.10 × 424.30
  4. Step 4: Simplify right side
    1,040.76x = 662,371.89
  5. Step 5: Solve for x
    x = 662,371.89/1,040.76
  6. Step 6: Final answer
    x = 636.43

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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.