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Finding the Fourth Proportional to 12,987.66, 19,459.11 and 10,143.88

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Solution

The fourth proportional to 12,987.66, 19,459.11 and 10,143.88 is: 15,198.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.66 : 19,459.11 = 10,143.88 : x
  2. Step 2: Convert to fraction form
    12,987.66/19,459.11 = 10,143.88/x
  3. Step 3: Cross multiply
    12,987.66x = 19,459.11 × 10,143.88
  4. Step 4: Simplify right side
    12,987.66x = 197,390,876.75
  5. Step 5: Solve for x
    x = 197,390,876.75/12,987.66
  6. Step 6: Final answer
    x = 15,198.34

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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.