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Finding the Fourth Proportional to 1,028.72, 1,543.12 and 412.40

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Solution

The fourth proportional to 1,028.72, 1,543.12 and 412.40 is: 618.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.72 : 1,543.12 = 412.40 : x
  2. Step 2: Convert to fraction form
    1,028.72/1,543.12 = 412.40/x
  3. Step 3: Cross multiply
    1,028.72x = 1,543.12 × 412.40
  4. Step 4: Simplify right side
    1,028.72x = 636,382.69
  5. Step 5: Solve for x
    x = 636,382.69/1,028.72
  6. Step 6: Final answer
    x = 618.62

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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.