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Finding the Fourth Proportional to 15,991.79, 22,069.12 and 8,918.66

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Solution

The fourth proportional to 15,991.79, 22,069.12 and 8,918.66 is: 12,308.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,991.79 : 22,069.12 = 8,918.66 : x
  2. Step 2: Convert to fraction form
    15,991.79/22,069.12 = 8,918.66/x
  3. Step 3: Cross multiply
    15,991.79x = 22,069.12 × 8,918.66
  4. Step 4: Simplify right side
    15,991.79x = 196,827,010.66
  5. Step 5: Solve for x
    x = 196,827,010.66/15,991.79
  6. Step 6: Final answer
    x = 12,308.01

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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.