Home / 80,719.17-121,079.47-28,128.57

Finding the Fourth Proportional to 80,719.17, 121,079.47 and 28,128.57

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Solution

The fourth proportional to 80,719.17, 121,079.47 and 28,128.57 is: 42,193.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,719.17 : 121,079.47 = 28,128.57 : x
  2. Step 2: Convert to fraction form
    80,719.17/121,079.47 = 28,128.57/x
  3. Step 3: Cross multiply
    80,719.17x = 121,079.47 × 28,128.57
  4. Step 4: Simplify right side
    80,719.17x = 3,405,792,347.46
  5. Step 5: Solve for x
    x = 3,405,792,347.46/80,719.17
  6. Step 6: Final answer
    x = 42,193.10

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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.