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Finding the Fourth Proportional to 287,666.67, 431,517.31 and 87,988.79

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Solution

The fourth proportional to 287,666.67, 431,517.31 and 87,988.79 is: 131,988.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,666.67 : 431,517.31 = 87,988.79 : x
  2. Step 2: Convert to fraction form
    287,666.67/431,517.31 = 87,988.79/x
  3. Step 3: Cross multiply
    287,666.67x = 431,517.31 × 87,988.79
  4. Step 4: Simplify right side
    287,666.67x = 37,968,685,970.95
  5. Step 5: Solve for x
    x = 37,968,685,970.95/287,666.67
  6. Step 6: Final answer
    x = 131,988.48

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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.