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Finding the Fourth Proportional to 85,612.38, 128,244.49 and 69,873.50

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Solution

The fourth proportional to 85,612.38, 128,244.49 and 69,873.50 is: 104,668.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,612.38 : 128,244.49 = 69,873.50 : x
  2. Step 2: Convert to fraction form
    85,612.38/128,244.49 = 69,873.50/x
  3. Step 3: Cross multiply
    85,612.38x = 128,244.49 × 69,873.50
  4. Step 4: Simplify right side
    85,612.38x = 8,960,891,372.02
  5. Step 5: Solve for x
    x = 8,960,891,372.02/85,612.38
  6. Step 6: Final answer
    x = 104,668.17

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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.