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Finding the Fourth Proportional to 268,259.80, 402,443.70 and 78,719.80

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Solution

The fourth proportional to 268,259.80, 402,443.70 and 78,719.80 is: 118,095.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,259.80 : 402,443.70 = 78,719.80 : x
  2. Step 2: Convert to fraction form
    268,259.80/402,443.70 = 78,719.80/x
  3. Step 3: Cross multiply
    268,259.80x = 402,443.70 × 78,719.80
  4. Step 4: Simplify right side
    268,259.80x = 31,680,287,575.26
  5. Step 5: Solve for x
    x = 31,680,287,575.26/268,259.80
  6. Step 6: Final answer
    x = 118,095.55

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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.