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Finding the Fourth Proportional to 139,887,508.80, 209,847,009.60 and 42,842,445.60

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Solution

The fourth proportional to 139,887,508.80, 209,847,009.60 and 42,842,445.60 is: 64,268,490.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,887,508.80 : 209,847,009.60 = 42,842,445.60 : x
  2. Step 2: Convert to fraction form
    139,887,508.80/209,847,009.60 = 42,842,445.60/x
  3. Step 3: Cross multiply
    139,887,508.80x = 209,847,009.60 × 42,842,445.60
  4. Step 4: Simplify right side
    139,887,508.80x = 8,990,359,093,110,678
  5. Step 5: Solve for x
    x = 8,990,359,093,110,678/139,887,508.80
  6. Step 6: Final answer
    x = 64,268,490.95

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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.