Home / 15,420.28-21,279.96-8,346.88

Finding the Fourth Proportional to 15,420.28, 21,279.96 and 8,346.88

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Solution

The fourth proportional to 15,420.28, 21,279.96 and 8,346.88 is: 11,518.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.28 : 21,279.96 = 8,346.88 : x
  2. Step 2: Convert to fraction form
    15,420.28/21,279.96 = 8,346.88/x
  3. Step 3: Cross multiply
    15,420.28x = 21,279.96 × 8,346.88
  4. Step 4: Simplify right side
    15,420.28x = 177,621,272.52
  5. Step 5: Solve for x
    x = 177,621,272.52/15,420.28
  6. Step 6: Final answer
    x = 11,518.68

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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.