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Finding the Fourth Proportional to 18,965.34, 28,448.15 and 8,432.91

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Solution

The fourth proportional to 18,965.34, 28,448.15 and 8,432.91 is: 12,649.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,965.34 : 28,448.15 = 8,432.91 : x
  2. Step 2: Convert to fraction form
    18,965.34/28,448.15 = 8,432.91/x
  3. Step 3: Cross multiply
    18,965.34x = 28,448.15 × 8,432.91
  4. Step 4: Simplify right side
    18,965.34x = 239,900,646.45
  5. Step 5: Solve for x
    x = 239,900,646.45/18,965.34
  6. Step 6: Final answer
    x = 12,649.43

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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.