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Finding the Fourth Proportional to 287,690.69, 431,520.38 and 88,011.07

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Solution

The fourth proportional to 287,690.69, 431,520.38 and 88,011.07 is: 132,011.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,690.69 : 431,520.38 = 88,011.07 : x
  2. Step 2: Convert to fraction form
    287,690.69/431,520.38 = 88,011.07/x
  3. Step 3: Cross multiply
    287,690.69x = 431,520.38 × 88,011.07
  4. Step 4: Simplify right side
    287,690.69x = 37,978,567,772.95
  5. Step 5: Solve for x
    x = 37,978,567,772.95/287,690.69
  6. Step 6: Final answer
    x = 132,011.81

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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.