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Finding the Fourth Proportional to 15,615.20, 21,548.04 and 8,899.88

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Solution

The fourth proportional to 15,615.20, 21,548.04 and 8,899.88 is: 12,281.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,615.20 : 21,548.04 = 8,899.88 : x
  2. Step 2: Convert to fraction form
    15,615.20/21,548.04 = 8,899.88/x
  3. Step 3: Cross multiply
    15,615.20x = 21,548.04 × 8,899.88
  4. Step 4: Simplify right side
    15,615.20x = 191,774,970.24
  5. Step 5: Solve for x
    x = 191,774,970.24/15,615.20
  6. Step 6: Final answer
    x = 12,281.30

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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.