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Finding the Fourth Proportional to 10,638.80, 15,920.40 and 9,267.20

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Solution

The fourth proportional to 10,638.80, 15,920.40 and 9,267.20 is: 13,867.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,638.80 : 15,920.40 = 9,267.20 : x
  2. Step 2: Convert to fraction form
    10,638.80/15,920.40 = 9,267.20/x
  3. Step 3: Cross multiply
    10,638.80x = 15,920.40 × 9,267.20
  4. Step 4: Simplify right side
    10,638.80x = 147,537,530.88
  5. Step 5: Solve for x
    x = 147,537,530.88/10,638.80
  6. Step 6: Final answer
    x = 13,867.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.