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Finding the Fourth Proportional to 91,808.20, 137,712.30 and 87,920.20

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Solution

The fourth proportional to 91,808.20, 137,712.30 and 87,920.20 is: 131,880.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,808.20 : 137,712.30 = 87,920.20 : x
  2. Step 2: Convert to fraction form
    91,808.20/137,712.30 = 87,920.20/x
  3. Step 3: Cross multiply
    91,808.20x = 137,712.30 × 87,920.20
  4. Step 4: Simplify right side
    91,808.20x = 12,107,692,958.46
  5. Step 5: Solve for x
    x = 12,107,692,958.46/91,808.20
  6. Step 6: Final answer
    x = 131,880.30

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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.