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Finding the Fourth Proportional to 18,695.90, 28,029.05 and 9,331.10

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Solution

The fourth proportional to 18,695.90, 28,029.05 and 9,331.10 is: 13,989.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,695.90 : 28,029.05 = 9,331.10 : x
  2. Step 2: Convert to fraction form
    18,695.90/28,029.05 = 9,331.10/x
  3. Step 3: Cross multiply
    18,695.90x = 28,029.05 × 9,331.10
  4. Step 4: Simplify right side
    18,695.90x = 261,541,908.74
  5. Step 5: Solve for x
    x = 261,541,908.74/18,695.90
  6. Step 6: Final answer
    x = 13,989.26

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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.