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Finding the Fourth Proportional to 86,417.40, 129,626.10 and 68,921.40

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Solution

The fourth proportional to 86,417.40, 129,626.10 and 68,921.40 is: 103,382.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,417.40 : 129,626.10 = 68,921.40 : x
  2. Step 2: Convert to fraction form
    86,417.40/129,626.10 = 68,921.40/x
  3. Step 3: Cross multiply
    86,417.40x = 129,626.10 × 68,921.40
  4. Step 4: Simplify right side
    86,417.40x = 8,934,012,288.54
  5. Step 5: Solve for x
    x = 8,934,012,288.54/86,417.40
  6. Step 6: Final answer
    x = 103,382.10

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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.