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Finding the Fourth Proportional to 91,712.10, 137,568.15 and 83,838.90

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Solution

The fourth proportional to 91,712.10, 137,568.15 and 83,838.90 is: 125,758.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,712.10 : 137,568.15 = 83,838.90 : x
  2. Step 2: Convert to fraction form
    91,712.10/137,568.15 = 83,838.90/x
  3. Step 3: Cross multiply
    91,712.10x = 137,568.15 × 83,838.90
  4. Step 4: Simplify right side
    91,712.10x = 11,533,562,371.04
  5. Step 5: Solve for x
    x = 11,533,562,371.04/91,712.10
  6. Step 6: Final answer
    x = 125,758.35

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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.