Home / 268,220.16-402,405.54-78,685

Finding the Fourth Proportional to 268,220.16, 402,405.54 and 78,685

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Solution

The fourth proportional to 268,220.16, 402,405.54 and 78,685 is: 118,049.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,220.16 : 402,405.54 = 78,685 : x
  2. Step 2: Convert to fraction form
    268,220.16/402,405.54 = 78,685/x
  3. Step 3: Cross multiply
    268,220.16x = 402,405.54 × 78,685
  4. Step 4: Simplify right side
    268,220.16x = 31,663,279,914.90
  5. Step 5: Solve for x
    x = 31,663,279,914.90/268,220.16
  6. Step 6: Final answer
    x = 118,049.59

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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.