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Finding the Fourth Proportional to 129,871.55, 194,457 and 84,781.23

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Solution

The fourth proportional to 129,871.55, 194,457 and 84,781.23 is: 126,943.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,871.55 : 194,457 = 84,781.23 : x
  2. Step 2: Convert to fraction form
    129,871.55/194,457 = 84,781.23/x
  3. Step 3: Cross multiply
    129,871.55x = 194,457 × 84,781.23
  4. Step 4: Simplify right side
    129,871.55x = 16,486,303,642.11
  5. Step 5: Solve for x
    x = 16,486,303,642.11/129,871.55
  6. Step 6: Final answer
    x = 126,943.15

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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.