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Finding the Fourth Proportional to 1,040.72, 1,560.60 and 423.90

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Solution

The fourth proportional to 1,040.72, 1,560.60 and 423.90 is: 635.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.72 : 1,560.60 = 423.90 : x
  2. Step 2: Convert to fraction form
    1,040.72/1,560.60 = 423.90/x
  3. Step 3: Cross multiply
    1,040.72x = 1,560.60 × 423.90
  4. Step 4: Simplify right side
    1,040.72x = 661,538.34
  5. Step 5: Solve for x
    x = 661,538.34/1,040.72
  6. Step 6: Final answer
    x = 635.66

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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.