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Finding the Fourth Proportional to 218,776.58, 301,909.88 and 121,979.28

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Solution

The fourth proportional to 218,776.58, 301,909.88 and 121,979.28 is: 168,330.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,776.58 : 301,909.88 = 121,979.28 : x
  2. Step 2: Convert to fraction form
    218,776.58/301,909.88 = 121,979.28/x
  3. Step 3: Cross multiply
    218,776.58x = 301,909.88 × 121,979.28
  4. Step 4: Simplify right side
    218,776.58x = 36,826,749,787.29
  5. Step 5: Solve for x
    x = 36,826,749,787.29/218,776.58
  6. Step 6: Final answer
    x = 168,330.40

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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.