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Finding the Fourth Proportional to 91,805.40, 137,708.10 and 87,431.40

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Solution

The fourth proportional to 91,805.40, 137,708.10 and 87,431.40 is: 131,147.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,805.40 : 137,708.10 = 87,431.40 : x
  2. Step 2: Convert to fraction form
    91,805.40/137,708.10 = 87,431.40/x
  3. Step 3: Cross multiply
    91,805.40x = 137,708.10 × 87,431.40
  4. Step 4: Simplify right side
    91,805.40x = 12,040,011,974.34
  5. Step 5: Solve for x
    x = 12,040,011,974.34/91,805.40
  6. Step 6: Final answer
    x = 131,147.10

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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.