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Finding the Fourth Proportional to 86,020.60, 129,030.90 and 81,427.90

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Solution

The fourth proportional to 86,020.60, 129,030.90 and 81,427.90 is: 122,141.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,020.60 : 129,030.90 = 81,427.90 : x
  2. Step 2: Convert to fraction form
    86,020.60/129,030.90 = 81,427.90/x
  3. Step 3: Cross multiply
    86,020.60x = 129,030.90 × 81,427.90
  4. Step 4: Simplify right side
    86,020.60x = 10,506,715,222.11
  5. Step 5: Solve for x
    x = 10,506,715,222.11/86,020.60
  6. Step 6: Final answer
    x = 122,141.85

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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.