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Finding the Fourth Proportional to 1,251.82, 1,877.75 and 430.30

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Solution

The fourth proportional to 1,251.82, 1,877.75 and 430.30 is: 645.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.82 : 1,877.75 = 430.30 : x
  2. Step 2: Convert to fraction form
    1,251.82/1,877.75 = 430.30/x
  3. Step 3: Cross multiply
    1,251.82x = 1,877.75 × 430.30
  4. Step 4: Simplify right side
    1,251.82x = 807,995.83
  5. Step 5: Solve for x
    x = 807,995.83/1,251.82
  6. Step 6: Final answer
    x = 645.46

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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.