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Finding the Fourth Proportional to 15,300.20, 21,155.90 and 13,331.90

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Solution

The fourth proportional to 15,300.20, 21,155.90 and 13,331.90 is: 18,434.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,300.20 : 21,155.90 = 13,331.90 : x
  2. Step 2: Convert to fraction form
    15,300.20/21,155.90 = 13,331.90/x
  3. Step 3: Cross multiply
    15,300.20x = 21,155.90 × 13,331.90
  4. Step 4: Simplify right side
    15,300.20x = 282,048,170.77
  5. Step 5: Solve for x
    x = 282,048,170.77/15,300.20
  6. Step 6: Final answer
    x = 18,434.29

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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.