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Finding the Fourth Proportional to 138,427.40, 207,641.10 and 68,443.40

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Solution

The fourth proportional to 138,427.40, 207,641.10 and 68,443.40 is: 102,665.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,427.40 : 207,641.10 = 68,443.40 : x
  2. Step 2: Convert to fraction form
    138,427.40/207,641.10 = 68,443.40/x
  3. Step 3: Cross multiply
    138,427.40x = 207,641.10 × 68,443.40
  4. Step 4: Simplify right side
    138,427.40x = 14,211,662,863.74
  5. Step 5: Solve for x
    x = 14,211,662,863.74/138,427.40
  6. Step 6: Final answer
    x = 102,665.10

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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.