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Finding the Fourth Proportional to 72,145.10, 108,217.65 and 66,896.30

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Solution

The fourth proportional to 72,145.10, 108,217.65 and 66,896.30 is: 100,344.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,145.10 : 108,217.65 = 66,896.30 : x
  2. Step 2: Convert to fraction form
    72,145.10/108,217.65 = 66,896.30/x
  3. Step 3: Cross multiply
    72,145.10x = 108,217.65 × 66,896.30
  4. Step 4: Simplify right side
    72,145.10x = 7,239,360,379.70
  5. Step 5: Solve for x
    x = 7,239,360,379.70/72,145.10
  6. Step 6: Final answer
    x = 100,344.45

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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.