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Finding the Fourth Proportional to 21,064.71, 29,065.84 and 12,449.69

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Solution

The fourth proportional to 21,064.71, 29,065.84 and 12,449.69 is: 17,178.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,064.71 : 29,065.84 = 12,449.69 : x
  2. Step 2: Convert to fraction form
    21,064.71/29,065.84 = 12,449.69/x
  3. Step 3: Cross multiply
    21,064.71x = 29,065.84 × 12,449.69
  4. Step 4: Simplify right side
    21,064.71x = 361,860,630.13
  5. Step 5: Solve for x
    x = 361,860,630.13/21,064.71
  6. Step 6: Final answer
    x = 17,178.52

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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.