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Finding the Fourth Proportional to 858,775.80, 1,287,062.10 and 479,695.80

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Solution

The fourth proportional to 858,775.80, 1,287,062.10 and 479,695.80 is: 718,928.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,775.80 : 1,287,062.10 = 479,695.80 : x
  2. Step 2: Convert to fraction form
    858,775.80/1,287,062.10 = 479,695.80/x
  3. Step 3: Cross multiply
    858,775.80x = 1,287,062.10 × 479,695.80
  4. Step 4: Simplify right side
    858,775.80x = 617,398,283,709.18
  5. Step 5: Solve for x
    x = 617,398,283,709.18/858,775.80
  6. Step 6: Final answer
    x = 718,928.37

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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.