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Finding the Fourth Proportional to 12,339.62, 17,031.84 and 7,621.20

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Solution

The fourth proportional to 12,339.62, 17,031.84 and 7,621.20 is: 10,519.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,339.62 : 17,031.84 = 7,621.20 : x
  2. Step 2: Convert to fraction form
    12,339.62/17,031.84 = 7,621.20/x
  3. Step 3: Cross multiply
    12,339.62x = 17,031.84 × 7,621.20
  4. Step 4: Simplify right side
    12,339.62x = 129,803,059.01
  5. Step 5: Solve for x
    x = 129,803,059.01/12,339.62
  6. Step 6: Final answer
    x = 10,519.21

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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.