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Finding the Fourth Proportional to 1,253.67, 1,880.45 and 431.95

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Solution

The fourth proportional to 1,253.67, 1,880.45 and 431.95 is: 647.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.67 : 1,880.45 = 431.95 : x
  2. Step 2: Convert to fraction form
    1,253.67/1,880.45 = 431.95/x
  3. Step 3: Cross multiply
    1,253.67x = 1,880.45 × 431.95
  4. Step 4: Simplify right side
    1,253.67x = 812,260.38
  5. Step 5: Solve for x
    x = 812,260.38/1,253.67
  6. Step 6: Final answer
    x = 647.91

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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.