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Finding the Fourth Proportional to 1,253.36, 1,879.85 and 431.55

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Solution

The fourth proportional to 1,253.36, 1,879.85 and 431.55 is: 647.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.36 : 1,879.85 = 431.55 : x
  2. Step 2: Convert to fraction form
    1,253.36/1,879.85 = 431.55/x
  3. Step 3: Cross multiply
    1,253.36x = 1,879.85 × 431.55
  4. Step 4: Simplify right side
    1,253.36x = 811,247.11
  5. Step 5: Solve for x
    x = 811,247.11/1,253.36
  6. Step 6: Final answer
    x = 647.26

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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.