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Finding the Fourth Proportional to 1,040.65, 1,560.51 and 423.90

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Solution

The fourth proportional to 1,040.65, 1,560.51 and 423.90 is: 635.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.65 : 1,560.51 = 423.90 : x
  2. Step 2: Convert to fraction form
    1,040.65/1,560.51 = 423.90/x
  3. Step 3: Cross multiply
    1,040.65x = 1,560.51 × 423.90
  4. Step 4: Simplify right side
    1,040.65x = 661,500.19
  5. Step 5: Solve for x
    x = 661,500.19/1,040.65
  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.