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Finding the Fourth Proportional to 91,625.60, 137,540.80 and 85,609.60

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Solution

The fourth proportional to 91,625.60, 137,540.80 and 85,609.60 is: 128,510.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,625.60 : 137,540.80 = 85,609.60 : x
  2. Step 2: Convert to fraction form
    91,625.60/137,540.80 = 85,609.60/x
  3. Step 3: Cross multiply
    91,625.60x = 137,540.80 × 85,609.60
  4. Step 4: Simplify right side
    91,625.60x = 11,774,812,871.68
  5. Step 5: Solve for x
    x = 11,774,812,871.68/91,625.60
  6. Step 6: Final answer
    x = 128,510.08

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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.