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Finding the Fourth Proportional to 287,712,815.20, 431,073,211.20 and 134,043,697.60

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Solution

The fourth proportional to 287,712,815.20, 431,073,211.20 and 134,043,697.60 is: 200,834,457.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,712,815.20 : 431,073,211.20 = 134,043,697.60 : x
  2. Step 2: Convert to fraction form
    287,712,815.20/431,073,211.20 = 134,043,697.60/x
  3. Step 3: Cross multiply
    287,712,815.20x = 431,073,211.20 × 134,043,697.60
  4. Step 4: Simplify right side
    287,712,815.20x = 57,782,647,165,553,728
  5. Step 5: Solve for x
    x = 57,782,647,165,553,728/287,712,815.20
  6. Step 6: Final answer
    x = 200,834,457.53

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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.