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Finding the Fourth Proportional to 91,976.40, 129,029.40 and 91,976.40

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Solution

The fourth proportional to 91,976.40, 129,029.40 and 91,976.40 is: 129,029.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,976.40 : 129,029.40 = 91,976.40 : x
  2. Step 2: Convert to fraction form
    91,976.40/129,029.40 = 91,976.40/x
  3. Step 3: Cross multiply
    91,976.40x = 129,029.40 × 91,976.40
  4. Step 4: Simplify right side
    91,976.40x = 11,867,659,706.16
  5. Step 5: Solve for x
    x = 11,867,659,706.16/91,976.40
  6. Step 6: Final answer
    x = 129,029.40

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.