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Finding the Fourth Proportional to 15,031.80, 20,748.12 and 8,745.48

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Solution

The fourth proportional to 15,031.80, 20,748.12 and 8,745.48 is: 12,071.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,031.80 : 20,748.12 = 8,745.48 : x
  2. Step 2: Convert to fraction form
    15,031.80/20,748.12 = 8,745.48/x
  3. Step 3: Cross multiply
    15,031.80x = 20,748.12 × 8,745.48
  4. Step 4: Simplify right side
    15,031.80x = 181,452,268.50
  5. Step 5: Solve for x
    x = 181,452,268.50/15,031.80
  6. Step 6: Final answer
    x = 12,071.23

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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.