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Finding the Fourth Proportional to 15,710.21, 21,659.87 and 12,867.11

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Solution

The fourth proportional to 15,710.21, 21,659.87 and 12,867.11 is: 17,740.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,710.21 : 21,659.87 = 12,867.11 : x
  2. Step 2: Convert to fraction form
    15,710.21/21,659.87 = 12,867.11/x
  3. Step 3: Cross multiply
    15,710.21x = 21,659.87 × 12,867.11
  4. Step 4: Simplify right side
    15,710.21x = 278,699,929.88
  5. Step 5: Solve for x
    x = 278,699,929.88/15,710.21
  6. Step 6: Final answer
    x = 17,740.05

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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.