Home / 21,115.14-29,138.52-11,683.70

Finding the Fourth Proportional to 21,115.14, 29,138.52 and 11,683.70

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Solution

The fourth proportional to 21,115.14, 29,138.52 and 11,683.70 is: 16,123.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.14 : 29,138.52 = 11,683.70 : x
  2. Step 2: Convert to fraction form
    21,115.14/29,138.52 = 11,683.70/x
  3. Step 3: Cross multiply
    21,115.14x = 29,138.52 × 11,683.70
  4. Step 4: Simplify right side
    21,115.14x = 340,445,726.12
  5. Step 5: Solve for x
    x = 340,445,726.12/21,115.14
  6. Step 6: Final answer
    x = 16,123.30

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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.