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Finding the Fourth Proportional to 287,449.91, 431,237.98 and 85,030.21

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Solution

The fourth proportional to 287,449.91, 431,237.98 and 85,030.21 is: 127,563.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,449.91 : 431,237.98 = 85,030.21 : x
  2. Step 2: Convert to fraction form
    287,449.91/431,237.98 = 85,030.21/x
  3. Step 3: Cross multiply
    287,449.91x = 431,237.98 × 85,030.21
  4. Step 4: Simplify right side
    287,449.91x = 36,668,253,740.70
  5. Step 5: Solve for x
    x = 36,668,253,740.70/287,449.91
  6. Step 6: Final answer
    x = 127,563.98

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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.