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Finding the Fourth Proportional to 12,656.76, 18,985.14 and 3,422.76

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Solution

The fourth proportional to 12,656.76, 18,985.14 and 3,422.76 is: 5,134.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,656.76 : 18,985.14 = 3,422.76 : x
  2. Step 2: Convert to fraction form
    12,656.76/18,985.14 = 3,422.76/x
  3. Step 3: Cross multiply
    12,656.76x = 18,985.14 × 3,422.76
  4. Step 4: Simplify right side
    12,656.76x = 64,981,577.79
  5. Step 5: Solve for x
    x = 64,981,577.79/12,656.76
  6. Step 6: Final answer
    x = 5,134.14

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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.