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Finding the Fourth Proportional to 287,553.45, 431,330.18 and 77,212.65

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Solution

The fourth proportional to 287,553.45, 431,330.18 and 77,212.65 is: 115,818.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,553.45 : 431,330.18 = 77,212.65 : x
  2. Step 2: Convert to fraction form
    287,553.45/431,330.18 = 77,212.65/x
  3. Step 3: Cross multiply
    287,553.45x = 431,330.18 × 77,212.65
  4. Step 4: Simplify right side
    287,553.45x = 33,304,145,836.71
  5. Step 5: Solve for x
    x = 33,304,145,836.71/287,553.45
  6. Step 6: Final answer
    x = 115,818.98

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1.5x scale

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.