Home / 85,839.16-128,671.26-78,272.20

Finding the Fourth Proportional to 85,839.16, 128,671.26 and 78,272.20

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Solution

The fourth proportional to 85,839.16, 128,671.26 and 78,272.20 is: 117,328.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,839.16 : 128,671.26 = 78,272.20 : x
  2. Step 2: Convert to fraction form
    85,839.16/128,671.26 = 78,272.20/x
  3. Step 3: Cross multiply
    85,839.16x = 128,671.26 × 78,272.20
  4. Step 4: Simplify right side
    85,839.16x = 10,071,382,596.97
  5. Step 5: Solve for x
    x = 10,071,382,596.97/85,839.16
  6. Step 6: Final answer
    x = 117,328.53

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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.