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Finding the Fourth Proportional to 1,040.13, 1,560.29 and 423.88

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Solution

The fourth proportional to 1,040.13, 1,560.29 and 423.88 is: 635.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.13 : 1,560.29 = 423.88 : x
  2. Step 2: Convert to fraction form
    1,040.13/1,560.29 = 423.88/x
  3. Step 3: Cross multiply
    1,040.13x = 1,560.29 × 423.88
  4. Step 4: Simplify right side
    1,040.13x = 661,369.71
  5. Step 5: Solve for x
    x = 661,369.71/1,040.13
  6. Step 6: Final answer
    x = 635.85

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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.