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Finding the Fourth Proportional to 139,968,561.70, 209,952,842.55 and 85,549,003.30

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Solution

The fourth proportional to 139,968,561.70, 209,952,842.55 and 85,549,003.30 is: 128,323,504.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,561.70 : 209,952,842.55 = 85,549,003.30 : x
  2. Step 2: Convert to fraction form
    139,968,561.70/209,952,842.55 = 85,549,003.30/x
  3. Step 3: Cross multiply
    139,968,561.70x = 209,952,842.55 × 85,549,003.30
  4. Step 4: Simplify right side
    139,968,561.70x = 17,961,256,420,154,330
  5. Step 5: Solve for x
    x = 17,961,256,420,154,330/139,968,561.70
  6. Step 6: Final answer
    x = 128,323,504.95

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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.