Home / 78,680.28-117,880.49-45,331.45

Finding the Fourth Proportional to 78,680.28, 117,880.49 and 45,331.45

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Solution

The fourth proportional to 78,680.28, 117,880.49 and 45,331.45 is: 67,916.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,680.28 : 117,880.49 = 45,331.45 : x
  2. Step 2: Convert to fraction form
    78,680.28/117,880.49 = 45,331.45/x
  3. Step 3: Cross multiply
    78,680.28x = 117,880.49 × 45,331.45
  4. Step 4: Simplify right side
    78,680.28x = 5,343,693,538.41
  5. Step 5: Solve for x
    x = 5,343,693,538.41/78,680.28
  6. Step 6: Final answer
    x = 67,916.55

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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.