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Finding the Fourth Proportional to 1,253.17, 1,879.80 and 431.47

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Solution

The fourth proportional to 1,253.17, 1,879.80 and 431.47 is: 647.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.17 : 1,879.80 = 431.47 : x
  2. Step 2: Convert to fraction form
    1,253.17/1,879.80 = 431.47/x
  3. Step 3: Cross multiply
    1,253.17x = 1,879.80 × 431.47
  4. Step 4: Simplify right side
    1,253.17x = 811,077.31
  5. Step 5: Solve for x
    x = 811,077.31/1,253.17
  6. Step 6: Final answer
    x = 647.22

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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.