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Finding the Fourth Proportional to 61,618.12, 91,981.31 and 54,144.68

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Solution

The fourth proportional to 61,618.12, 91,981.31 and 54,144.68 is: 80,825.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,618.12 : 91,981.31 = 54,144.68 : x
  2. Step 2: Convert to fraction form
    61,618.12/91,981.31 = 54,144.68/x
  3. Step 3: Cross multiply
    61,618.12x = 91,981.31 × 54,144.68
  4. Step 4: Simplify right side
    61,618.12x = 4,980,298,595.93
  5. Step 5: Solve for x
    x = 4,980,298,595.93/61,618.12
  6. Step 6: Final answer
    x = 80,825.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.