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Finding the Fourth Proportional to 71,319,801.20, 106,979,701.80 and 20,201,154.80

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Solution

The fourth proportional to 71,319,801.20, 106,979,701.80 and 20,201,154.80 is: 30,301,732.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,319,801.20 : 106,979,701.80 = 20,201,154.80 : x
  2. Step 2: Convert to fraction form
    71,319,801.20/106,979,701.80 = 20,201,154.80/x
  3. Step 3: Cross multiply
    71,319,801.20x = 106,979,701.80 × 20,201,154.80
  4. Step 4: Simplify right side
    71,319,801.20x = 2,161,113,516,519,638.75
  5. Step 5: Solve for x
    x = 2,161,113,516,519,638.75/71,319,801.20
  6. Step 6: Final answer
    x = 30,301,732.20

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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.