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Finding the Fourth Proportional to 215,939.80, 323,909.70 and 121,461.40

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Solution

The fourth proportional to 215,939.80, 323,909.70 and 121,461.40 is: 182,192.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,939.80 : 323,909.70 = 121,461.40 : x
  2. Step 2: Convert to fraction form
    215,939.80/323,909.70 = 121,461.40/x
  3. Step 3: Cross multiply
    215,939.80x = 323,909.70 × 121,461.40
  4. Step 4: Simplify right side
    215,939.80x = 39,342,525,635.58
  5. Step 5: Solve for x
    x = 39,342,525,635.58/215,939.80
  6. Step 6: Final answer
    x = 182,192.10

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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.