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Finding the Fourth Proportional to 330,436.81, 495,655.69 and 81,118.81

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Solution

The fourth proportional to 330,436.81, 495,655.69 and 81,118.81 is: 121,678.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    330,436.81 : 495,655.69 = 81,118.81 : x
  2. Step 2: Convert to fraction form
    330,436.81/495,655.69 = 81,118.81/x
  3. Step 3: Cross multiply
    330,436.81x = 495,655.69 × 81,118.81
  4. Step 4: Simplify right side
    330,436.81x = 40,206,999,742.53
  5. Step 5: Solve for x
    x = 40,206,999,742.53/330,436.81
  6. Step 6: Final answer
    x = 121,678.33

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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.