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Finding the Fourth Proportional to 15,615.35, 21,549.74 and 8,899.90

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Solution

The fourth proportional to 15,615.35, 21,549.74 and 8,899.90 is: 12,282.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,615.35 : 21,549.74 = 8,899.90 : x
  2. Step 2: Convert to fraction form
    15,615.35/21,549.74 = 8,899.90/x
  3. Step 3: Cross multiply
    15,615.35x = 21,549.74 × 8,899.90
  4. Step 4: Simplify right side
    15,615.35x = 191,790,445.53
  5. Step 5: Solve for x
    x = 191,790,445.53/15,615.35
  6. Step 6: Final answer
    x = 12,282.17

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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.