Home / 15,156.40-20,919.72-13,581.76

Finding the Fourth Proportional to 15,156.40, 20,919.72 and 13,581.76

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Solution

The fourth proportional to 15,156.40, 20,919.72 and 13,581.76 is: 18,746.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,156.40 : 20,919.72 = 13,581.76 : x
  2. Step 2: Convert to fraction form
    15,156.40/20,919.72 = 13,581.76/x
  3. Step 3: Cross multiply
    15,156.40x = 20,919.72 × 13,581.76
  4. Step 4: Simplify right side
    15,156.40x = 284,126,616.31
  5. Step 5: Solve for x
    x = 284,126,616.31/15,156.40
  6. Step 6: Final answer
    x = 18,746.31

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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.