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Finding the Fourth Proportional to 287,819.65, 431,690.59 and 77,470.21

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Solution

The fourth proportional to 287,819.65, 431,690.59 and 77,470.21 is: 116,194.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,819.65 : 431,690.59 = 77,470.21 : x
  2. Step 2: Convert to fraction form
    287,819.65/431,690.59 = 77,470.21/x
  3. Step 3: Cross multiply
    287,819.65x = 431,690.59 × 77,470.21
  4. Step 4: Simplify right side
    287,819.65x = 33,443,160,662.32
  5. Step 5: Solve for x
    x = 33,443,160,662.32/287,819.65
  6. Step 6: Final answer
    x = 116,194.85

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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.