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Finding the Fourth Proportional to 218,780.96, 328,171.44 and 69,036.40

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Solution

The fourth proportional to 218,780.96, 328,171.44 and 69,036.40 is: 103,554.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,780.96 : 328,171.44 = 69,036.40 : x
  2. Step 2: Convert to fraction form
    218,780.96/328,171.44 = 69,036.40/x
  3. Step 3: Cross multiply
    218,780.96x = 328,171.44 × 69,036.40
  4. Step 4: Simplify right side
    218,780.96x = 22,655,774,800.42
  5. Step 5: Solve for x
    x = 22,655,774,800.42/218,780.96
  6. Step 6: Final answer
    x = 103,554.60

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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.