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Finding the Fourth Proportional to 67,720.69, 100,866 and 64,164.40

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Solution

The fourth proportional to 67,720.69, 100,866 and 64,164.40 is: 95,569.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,720.69 : 100,866 = 64,164.40 : x
  2. Step 2: Convert to fraction form
    67,720.69/100,866 = 64,164.40/x
  3. Step 3: Cross multiply
    67,720.69x = 100,866 × 64,164.40
  4. Step 4: Simplify right side
    67,720.69x = 6,472,006,370.40
  5. Step 5: Solve for x
    x = 6,472,006,370.40/67,720.69
  6. Step 6: Final answer
    x = 95,569.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.