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Finding the Fourth Proportional to 81,490.86, 112,457.25 and 45,680.90

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Solution

The fourth proportional to 81,490.86, 112,457.25 and 45,680.90 is: 63,039.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,490.86 : 112,457.25 = 45,680.90 : x
  2. Step 2: Convert to fraction form
    81,490.86/112,457.25 = 45,680.90/x
  3. Step 3: Cross multiply
    81,490.86x = 112,457.25 × 45,680.90
  4. Step 4: Simplify right side
    81,490.86x = 5,137,147,829.24
  5. Step 5: Solve for x
    x = 5,137,147,829.24/81,490.86
  6. Step 6: Final answer
    x = 63,039.56

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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.