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Finding the Fourth Proportional to 18,934.24, 28,396.72 and 8,398.40

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Solution

The fourth proportional to 18,934.24, 28,396.72 and 8,398.40 is: 12,595.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,934.24 : 28,396.72 = 8,398.40 : x
  2. Step 2: Convert to fraction form
    18,934.24/28,396.72 = 8,398.40/x
  3. Step 3: Cross multiply
    18,934.24x = 28,396.72 × 8,398.40
  4. Step 4: Simplify right side
    18,934.24x = 238,487,013.25
  5. Step 5: Solve for x
    x = 238,487,013.25/18,934.24
  6. Step 6: Final answer
    x = 12,595.54

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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.