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Finding the Fourth Proportional to 139,065,685.60, 208,515,584.40 and 85,251,618.40

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Solution

The fourth proportional to 139,065,685.60, 208,515,584.40 and 85,251,618.40 is: 127,826,580.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,065,685.60 : 208,515,584.40 = 85,251,618.40 : x
  2. Step 2: Convert to fraction form
    139,065,685.60/208,515,584.40 = 85,251,618.40/x
  3. Step 3: Cross multiply
    139,065,685.60x = 208,515,584.40 × 85,251,618.40
  4. Step 4: Simplify right side
    139,065,685.60x = 17,776,291,031,721,794
  5. Step 5: Solve for x
    x = 17,776,291,031,721,794/139,065,685.60
  6. Step 6: Final answer
    x = 127,826,580.33

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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.