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Finding the Fourth Proportional to 85,416.92, 128,082.36 and 28,470.65

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Solution

The fourth proportional to 85,416.92, 128,082.36 and 28,470.65 is: 42,691.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,416.92 : 128,082.36 = 28,470.65 : x
  2. Step 2: Convert to fraction form
    85,416.92/128,082.36 = 28,470.65/x
  3. Step 3: Cross multiply
    85,416.92x = 128,082.36 × 28,470.65
  4. Step 4: Simplify right side
    85,416.92x = 3,646,588,362.94
  5. Step 5: Solve for x
    x = 3,646,588,362.94/85,416.92
  6. Step 6: Final answer
    x = 42,691.64

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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.