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Finding the Fourth Proportional to 68,381.80, 102,572.70 and 66,999.40

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Solution

The fourth proportional to 68,381.80, 102,572.70 and 66,999.40 is: 100,499.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,381.80 : 102,572.70 = 66,999.40 : x
  2. Step 2: Convert to fraction form
    68,381.80/102,572.70 = 66,999.40/x
  3. Step 3: Cross multiply
    68,381.80x = 102,572.70 × 66,999.40
  4. Step 4: Simplify right side
    68,381.80x = 6,872,309,356.38
  5. Step 5: Solve for x
    x = 6,872,309,356.38/68,381.80
  6. Step 6: Final answer
    x = 100,499.10

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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.