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Finding the Fourth Proportional to 85,577.40, 128,123.10 and 80,922.60

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Solution

The fourth proportional to 85,577.40, 128,123.10 and 80,922.60 is: 121,154.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,577.40 : 128,123.10 = 80,922.60 : x
  2. Step 2: Convert to fraction form
    85,577.40/128,123.10 = 80,922.60/x
  3. Step 3: Cross multiply
    85,577.40x = 128,123.10 × 80,922.60
  4. Step 4: Simplify right side
    85,577.40x = 10,368,054,372.06
  5. Step 5: Solve for x
    x = 10,368,054,372.06/85,577.40
  6. Step 6: Final answer
    x = 121,154.12

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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.