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Finding the Fourth Proportional to 15,031.30, 20,742.78 and 8,317.21

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Solution

The fourth proportional to 15,031.30, 20,742.78 and 8,317.21 is: 11,477.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,031.30 : 20,742.78 = 8,317.21 : x
  2. Step 2: Convert to fraction form
    15,031.30/20,742.78 = 8,317.21/x
  3. Step 3: Cross multiply
    15,031.30x = 20,742.78 × 8,317.21
  4. Step 4: Simplify right side
    15,031.30x = 172,522,017.13
  5. Step 5: Solve for x
    x = 172,522,017.13/15,031.30
  6. Step 6: Final answer
    x = 11,477.52

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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.