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Finding the Fourth Proportional to 13,680.78, 20,521.17 and 10,565.34

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Solution

The fourth proportional to 13,680.78, 20,521.17 and 10,565.34 is: 15,848.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,680.78 : 20,521.17 = 10,565.34 : x
  2. Step 2: Convert to fraction form
    13,680.78/20,521.17 = 10,565.34/x
  3. Step 3: Cross multiply
    13,680.78x = 20,521.17 × 10,565.34
  4. Step 4: Simplify right side
    13,680.78x = 216,813,138.25
  5. Step 5: Solve for x
    x = 216,813,138.25/13,680.78
  6. Step 6: Final answer
    x = 15,848.01

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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.