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Finding the Fourth Proportional to 15,013.64, 20,720.89 and 8,640.11

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Solution

The fourth proportional to 15,013.64, 20,720.89 and 8,640.11 is: 11,924.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,013.64 : 20,720.89 = 8,640.11 : x
  2. Step 2: Convert to fraction form
    15,013.64/20,720.89 = 8,640.11/x
  3. Step 3: Cross multiply
    15,013.64x = 20,720.89 × 8,640.11
  4. Step 4: Simplify right side
    15,013.64x = 179,030,643.69
  5. Step 5: Solve for x
    x = 179,030,643.69/15,013.64
  6. Step 6: Final answer
    x = 11,924.53

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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.