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Finding the Fourth Proportional to 72,009.20, 108,013.80 and 68,728.70

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Solution

The fourth proportional to 72,009.20, 108,013.80 and 68,728.70 is: 103,093.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,009.20 : 108,013.80 = 68,728.70 : x
  2. Step 2: Convert to fraction form
    72,009.20/108,013.80 = 68,728.70/x
  3. Step 3: Cross multiply
    72,009.20x = 108,013.80 × 68,728.70
  4. Step 4: Simplify right side
    72,009.20x = 7,423,648,056.06
  5. Step 5: Solve for x
    x = 7,423,648,056.06/72,009.20
  6. Step 6: Final answer
    x = 103,093.05

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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.