Home / 78,079.49-117,118.85-18,915.17

Finding the Fourth Proportional to 78,079.49, 117,118.85 and 18,915.17

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Solution

The fourth proportional to 78,079.49, 117,118.85 and 18,915.17 is: 28,372.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,079.49 : 117,118.85 = 18,915.17 : x
  2. Step 2: Convert to fraction form
    78,079.49/117,118.85 = 18,915.17/x
  3. Step 3: Cross multiply
    78,079.49x = 117,118.85 × 18,915.17
  4. Step 4: Simplify right side
    78,079.49x = 2,215,322,277.78
  5. Step 5: Solve for x
    x = 2,215,322,277.78/78,079.49
  6. Step 6: Final answer
    x = 28,372.65

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1.5x scale

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.