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Finding the Fourth Proportional to 330,706.64, 496,061.88 and 81,386.96

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Solution

The fourth proportional to 330,706.64, 496,061.88 and 81,386.96 is: 122,080.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    330,706.64 : 496,061.88 = 81,386.96 : x
  2. Step 2: Convert to fraction form
    330,706.64/496,061.88 = 81,386.96/x
  3. Step 3: Cross multiply
    330,706.64x = 496,061.88 × 81,386.96
  4. Step 4: Simplify right side
    330,706.64x = 40,372,968,385.08
  5. Step 5: Solve for x
    x = 40,372,968,385.08/330,706.64
  6. Step 6: Final answer
    x = 122,080.91

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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.