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Finding the Fourth Proportional to 86,551.50, 129,827.25 and 20,887.50

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Solution

The fourth proportional to 86,551.50, 129,827.25 and 20,887.50 is: 31,331.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,551.50 : 129,827.25 = 20,887.50 : x
  2. Step 2: Convert to fraction form
    86,551.50/129,827.25 = 20,887.50/x
  3. Step 3: Cross multiply
    86,551.50x = 129,827.25 × 20,887.50
  4. Step 4: Simplify right side
    86,551.50x = 2,711,766,684.38
  5. Step 5: Solve for x
    x = 2,711,766,684.38/86,551.50
  6. Step 6: Final answer
    x = 31,331.25

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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.