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Finding the Fourth Proportional to 85,972.70, 128,959.05 and 80,140.70

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Solution

The fourth proportional to 85,972.70, 128,959.05 and 80,140.70 is: 120,211.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,972.70 : 128,959.05 = 80,140.70 : x
  2. Step 2: Convert to fraction form
    85,972.70/128,959.05 = 80,140.70/x
  3. Step 3: Cross multiply
    85,972.70x = 128,959.05 × 80,140.70
  4. Step 4: Simplify right side
    85,972.70x = 10,334,868,538.34
  5. Step 5: Solve for x
    x = 10,334,868,538.34/85,972.70
  6. Step 6: Final answer
    x = 120,211.05

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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.