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Finding the Fourth Proportional to 1,253.70, 1,879.89 and 431.75

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Solution

The fourth proportional to 1,253.70, 1,879.89 and 431.75 is: 647.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.70 : 1,879.89 = 431.75 : x
  2. Step 2: Convert to fraction form
    1,253.70/1,879.89 = 431.75/x
  3. Step 3: Cross multiply
    1,253.70x = 1,879.89 × 431.75
  4. Step 4: Simplify right side
    1,253.70x = 811,642.51
  5. Step 5: Solve for x
    x = 811,642.51/1,253.70
  6. Step 6: Final answer
    x = 647.40

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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.