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Finding the Fourth Proportional to 72,011.70, 108,017.55 and 68,731.20

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Solution

The fourth proportional to 72,011.70, 108,017.55 and 68,731.20 is: 103,096.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,011.70 : 108,017.55 = 68,731.20 : x
  2. Step 2: Convert to fraction form
    72,011.70/108,017.55 = 68,731.20/x
  3. Step 3: Cross multiply
    72,011.70x = 108,017.55 × 68,731.20
  4. Step 4: Simplify right side
    72,011.70x = 7,424,175,832.56
  5. Step 5: Solve for x
    x = 7,424,175,832.56/72,011.70
  6. Step 6: Final answer
    x = 103,096.80

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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.