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Finding the Fourth Proportional to 18,916.32, 26,104.80 and 10,959.12

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Solution

The fourth proportional to 18,916.32, 26,104.80 and 10,959.12 is: 15,123.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,916.32 : 26,104.80 = 10,959.12 : x
  2. Step 2: Convert to fraction form
    18,916.32/26,104.80 = 10,959.12/x
  3. Step 3: Cross multiply
    18,916.32x = 26,104.80 × 10,959.12
  4. Step 4: Simplify right side
    18,916.32x = 286,085,635.78
  5. Step 5: Solve for x
    x = 286,085,635.78/18,916.32
  6. Step 6: Final answer
    x = 15,123.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.