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Finding the Fourth Proportional to 100,742,421.30, 150,861,689.55 and 80,587,029.30

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Solution

The fourth proportional to 100,742,421.30, 150,861,689.55 and 80,587,029.30 is: 120,679,007.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,742,421.30 : 150,861,689.55 = 80,587,029.30 : x
  2. Step 2: Convert to fraction form
    100,742,421.30/150,861,689.55 = 80,587,029.30/x
  3. Step 3: Cross multiply
    100,742,421.30x = 150,861,689.55 × 80,587,029.30
  4. Step 4: Simplify right side
    100,742,421.30x = 12,157,495,396,013,354
  5. Step 5: Solve for x
    x = 12,157,495,396,013,354/100,742,421.30
  6. Step 6: Final answer
    x = 120,679,007.31

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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.