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Finding the Fourth Proportional to 139,969,288.80, 209,953,933.20 and 85,549,730.40

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Solution

The fourth proportional to 139,969,288.80, 209,953,933.20 and 85,549,730.40 is: 128,324,595.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,288.80 : 209,953,933.20 = 85,549,730.40 : x
  2. Step 2: Convert to fraction form
    139,969,288.80/209,953,933.20 = 85,549,730.40/x
  3. Step 3: Cross multiply
    139,969,288.80x = 209,953,933.20 × 85,549,730.40
  4. Step 4: Simplify right side
    139,969,288.80x = 17,961,502,381,679,610
  5. Step 5: Solve for x
    x = 17,961,502,381,679,610/139,969,288.80
  6. Step 6: Final answer
    x = 128,324,595.60

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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.