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Finding the Fourth Proportional to 139,969,008.40, 209,953,512.60 and 78,747,005.20

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Solution

The fourth proportional to 139,969,008.40, 209,953,512.60 and 78,747,005.20 is: 118,120,507.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,008.40 : 209,953,512.60 = 78,747,005.20 : x
  2. Step 2: Convert to fraction form
    139,969,008.40/209,953,512.60 = 78,747,005.20/x
  3. Step 3: Cross multiply
    139,969,008.40x = 209,953,512.60 × 78,747,005.20
  4. Step 4: Simplify right side
    139,969,008.40x = 16,533,210,348,470,466
  5. Step 5: Solve for x
    x = 16,533,210,348,470,466/139,969,008.40
  6. Step 6: Final answer
    x = 118,120,507.80

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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.