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Finding the Fourth Proportional to 287,618.52, 431,427.78 and 87,938.91

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Solution

The fourth proportional to 287,618.52, 431,427.78 and 87,938.91 is: 131,908.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,618.52 : 431,427.78 = 87,938.91 : x
  2. Step 2: Convert to fraction form
    287,618.52/431,427.78 = 87,938.91/x
  3. Step 3: Cross multiply
    287,618.52x = 431,427.78 × 87,938.91
  4. Step 4: Simplify right side
    287,618.52x = 37,939,288,716.92
  5. Step 5: Solve for x
    x = 37,939,288,716.92/287,618.52
  6. Step 6: Final answer
    x = 131,908.37

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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.