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Finding the Fourth Proportional to 81,486.45, 112,449.15 and 45,678.78

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Solution

The fourth proportional to 81,486.45, 112,449.15 and 45,678.78 is: 63,035.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,486.45 : 112,449.15 = 45,678.78 : x
  2. Step 2: Convert to fraction form
    81,486.45/112,449.15 = 45,678.78/x
  3. Step 3: Cross multiply
    81,486.45x = 112,449.15 × 45,678.78
  4. Step 4: Simplify right side
    81,486.45x = 5,136,539,984.04
  5. Step 5: Solve for x
    x = 5,136,539,984.04/81,486.45
  6. Step 6: Final answer
    x = 63,035.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.