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Finding the Fourth Proportional to 15,931.56, 21,987.33 and 9,217.11

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Solution

The fourth proportional to 15,931.56, 21,987.33 and 9,217.11 is: 12,720.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,931.56 : 21,987.33 = 9,217.11 : x
  2. Step 2: Convert to fraction form
    15,931.56/21,987.33 = 9,217.11/x
  3. Step 3: Cross multiply
    15,931.56x = 21,987.33 × 9,217.11
  4. Step 4: Simplify right side
    15,931.56x = 202,659,639.22
  5. Step 5: Solve for x
    x = 202,659,639.22/15,931.56
  6. Step 6: Final answer
    x = 12,720.64

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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.