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Finding the Fourth Proportional to 85,449.66, 128,130.42 and 49,980.18

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Solution

The fourth proportional to 85,449.66, 128,130.42 and 49,980.18 is: 74,944.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,449.66 : 128,130.42 = 49,980.18 : x
  2. Step 2: Convert to fraction form
    85,449.66/128,130.42 = 49,980.18/x
  3. Step 3: Cross multiply
    85,449.66x = 128,130.42 × 49,980.18
  4. Step 4: Simplify right side
    85,449.66x = 6,403,981,455.08
  5. Step 5: Solve for x
    x = 6,403,981,455.08/85,449.66
  6. Step 6: Final answer
    x = 74,944.49

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Double scale
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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.