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Finding the Fourth Proportional to 139,979,492.80, 209,969,239.20 and 132,043,307.20

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Solution

The fourth proportional to 139,979,492.80, 209,969,239.20 and 132,043,307.20 is: 198,064,960.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,979,492.80 : 209,969,239.20 = 132,043,307.20 : x
  2. Step 2: Convert to fraction form
    139,979,492.80/209,969,239.20 = 132,043,307.20/x
  3. Step 3: Cross multiply
    139,979,492.80x = 209,969,239.20 × 132,043,307.20
  4. Step 4: Simplify right side
    139,979,492.80x = 27,725,032,754,235,880
  5. Step 5: Solve for x
    x = 27,725,032,754,235,880/139,979,492.80
  6. Step 6: Final answer
    x = 198,064,960.80

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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.