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Finding the Fourth Proportional to 85,428.70, 128,143.05 and 80,590.30

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Solution

The fourth proportional to 85,428.70, 128,143.05 and 80,590.30 is: 120,885.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,428.70 : 128,143.05 = 80,590.30 : x
  2. Step 2: Convert to fraction form
    85,428.70/128,143.05 = 80,590.30/x
  3. Step 3: Cross multiply
    85,428.70x = 128,143.05 × 80,590.30
  4. Step 4: Simplify right side
    85,428.70x = 10,327,086,842.42
  5. Step 5: Solve for x
    x = 10,327,086,842.42/85,428.70
  6. Step 6: Final answer
    x = 120,885.45

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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.