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Finding the Fourth Proportional to 858,405.60, 1,287,608.40 and 659,728.80

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Solution

The fourth proportional to 858,405.60, 1,287,608.40 and 659,728.80 is: 989,593.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,405.60 : 1,287,608.40 = 659,728.80 : x
  2. Step 2: Convert to fraction form
    858,405.60/1,287,608.40 = 659,728.80/x
  3. Step 3: Cross multiply
    858,405.60x = 1,287,608.40 × 659,728.80
  4. Step 4: Simplify right side
    858,405.60x = 849,472,344,601.92
  5. Step 5: Solve for x
    x = 849,472,344,601.92/858,405.60
  6. Step 6: Final answer
    x = 989,593.20

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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.