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Finding the Fourth Proportional to 858,720.30, 1,286,978.85 and 479,640.30

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Solution

The fourth proportional to 858,720.30, 1,286,978.85 and 479,640.30 is: 718,845.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,720.30 : 1,286,978.85 = 479,640.30 : x
  2. Step 2: Convert to fraction form
    858,720.30/1,286,978.85 = 479,640.30/x
  3. Step 3: Cross multiply
    858,720.30x = 1,286,978.85 × 479,640.30
  4. Step 4: Simplify right side
    858,720.30x = 617,286,921,707.66
  5. Step 5: Solve for x
    x = 617,286,921,707.66/858,720.30
  6. Step 6: Final answer
    x = 718,845.15

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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.