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Finding the Fourth Proportional to 218,970.39, 328,309.67 and 78,710.79

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Solution

The fourth proportional to 218,970.39, 328,309.67 and 78,710.79 is: 118,013.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,970.39 : 328,309.67 = 78,710.79 : x
  2. Step 2: Convert to fraction form
    218,970.39/328,309.67 = 78,710.79/x
  3. Step 3: Cross multiply
    218,970.39x = 328,309.67 × 78,710.79
  4. Step 4: Simplify right side
    218,970.39x = 25,841,513,096.79
  5. Step 5: Solve for x
    x = 25,841,513,096.79/218,970.39
  6. Step 6: Final answer
    x = 118,013.73

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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.