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Finding the Fourth Proportional to 72,706.80, 109,060.20 and 66,145.80

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Solution

The fourth proportional to 72,706.80, 109,060.20 and 66,145.80 is: 99,218.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,706.80 : 109,060.20 = 66,145.80 : x
  2. Step 2: Convert to fraction form
    72,706.80/109,060.20 = 66,145.80/x
  3. Step 3: Cross multiply
    72,706.80x = 109,060.20 × 66,145.80
  4. Step 4: Simplify right side
    72,706.80x = 7,213,874,177.16
  5. Step 5: Solve for x
    x = 7,213,874,177.16/72,706.80
  6. Step 6: Final answer
    x = 99,218.70

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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.