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Finding the Fourth Proportional to 15,014.56, 20,720.10 and 8,390.56

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Solution

The fourth proportional to 15,014.56, 20,720.10 and 8,390.56 is: 11,578.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,014.56 : 20,720.10 = 8,390.56 : x
  2. Step 2: Convert to fraction form
    15,014.56/20,720.10 = 8,390.56/x
  3. Step 3: Cross multiply
    15,014.56x = 20,720.10 × 8,390.56
  4. Step 4: Simplify right side
    15,014.56x = 173,853,242.26
  5. Step 5: Solve for x
    x = 173,853,242.26/15,014.56
  6. Step 6: Final answer
    x = 11,578.98

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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.