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Finding the Fourth Proportional to 139,065,715.60, 208,515,629.40 and 85,251,648.40

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Solution

The fourth proportional to 139,065,715.60, 208,515,629.40 and 85,251,648.40 is: 127,826,625.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,065,715.60 : 208,515,629.40 = 85,251,648.40 : x
  2. Step 2: Convert to fraction form
    139,065,715.60/208,515,629.40 = 85,251,648.40/x
  3. Step 3: Cross multiply
    139,065,715.60x = 208,515,629.40 × 85,251,648.40
  4. Step 4: Simplify right side
    139,065,715.60x = 17,776,301,123,513,504
  5. Step 5: Solve for x
    x = 17,776,301,123,513,504/139,065,715.60
  6. Step 6: Final answer
    x = 127,826,625.32

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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.