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Finding the Fourth Proportional to 18,821.15, 28,242.65 and 8,432.90

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Solution

The fourth proportional to 18,821.15, 28,242.65 and 8,432.90 is: 12,654.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.15 : 28,242.65 = 8,432.90 : x
  2. Step 2: Convert to fraction form
    18,821.15/28,242.65 = 8,432.90/x
  3. Step 3: Cross multiply
    18,821.15x = 28,242.65 × 8,432.90
  4. Step 4: Simplify right side
    18,821.15x = 238,167,259.81
  5. Step 5: Solve for x
    x = 238,167,259.81/18,821.15
  6. Step 6: Final answer
    x = 12,654.24

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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.