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Finding the Fourth Proportional to 858,792.80, 1,287,087.60 and 479,712.80

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Solution

The fourth proportional to 858,792.80, 1,287,087.60 and 479,712.80 is: 718,953.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,792.80 : 1,287,087.60 = 479,712.80 : x
  2. Step 2: Convert to fraction form
    858,792.80/1,287,087.60 = 479,712.80/x
  3. Step 3: Cross multiply
    858,792.80x = 1,287,087.60 × 479,712.80
  4. Step 4: Simplify right side
    858,792.80x = 617,432,396,441.28
  5. Step 5: Solve for x
    x = 617,432,396,441.28/858,792.80
  6. Step 6: Final answer
    x = 718,953.86

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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.