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Finding the Fourth Proportional to 611,691.70, 858,139.85 and 611,691.70

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Solution

The fourth proportional to 611,691.70, 858,139.85 and 611,691.70 is: 858,139.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,691.70 : 858,139.85 = 611,691.70 : x
  2. Step 2: Convert to fraction form
    611,691.70/858,139.85 = 611,691.70/x
  3. Step 3: Cross multiply
    611,691.70x = 858,139.85 × 611,691.70
  4. Step 4: Simplify right side
    611,691.70x = 524,917,023,684.25
  5. Step 5: Solve for x
    x = 524,917,023,684.25/611,691.70
  6. Step 6: Final answer
    x = 858,139.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.