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Finding the Fourth Proportional to 1,042.80, 1,564.12 and 273.28

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Solution

The fourth proportional to 1,042.80, 1,564.12 and 273.28 is: 409.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.80 : 1,564.12 = 273.28 : x
  2. Step 2: Convert to fraction form
    1,042.80/1,564.12 = 273.28/x
  3. Step 3: Cross multiply
    1,042.80x = 1,564.12 × 273.28
  4. Step 4: Simplify right side
    1,042.80x = 427,442.71
  5. Step 5: Solve for x
    x = 427,442.71/1,042.80
  6. Step 6: Final answer
    x = 409.90

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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.