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Finding the Fourth Proportional to 72,000.70, 108,001.05 and 68,720.20

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Solution

The fourth proportional to 72,000.70, 108,001.05 and 68,720.20 is: 103,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,000.70 : 108,001.05 = 68,720.20 : x
  2. Step 2: Convert to fraction form
    72,000.70/108,001.05 = 68,720.20/x
  3. Step 3: Cross multiply
    72,000.70x = 108,001.05 × 68,720.20
  4. Step 4: Simplify right side
    72,000.70x = 7,421,853,756.21
  5. Step 5: Solve for x
    x = 7,421,853,756.21/72,000.70
  6. Step 6: Final answer
    x = 103,080.30

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1.5x scale

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.