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Finding the Fourth Proportional to 28,514.40, 42,778.90 and 11,868.90

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Solution

The fourth proportional to 28,514.40, 42,778.90 and 11,868.90 is: 17,806.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,514.40 : 42,778.90 = 11,868.90 : x
  2. Step 2: Convert to fraction form
    28,514.40/42,778.90 = 11,868.90/x
  3. Step 3: Cross multiply
    28,514.40x = 42,778.90 × 11,868.90
  4. Step 4: Simplify right side
    28,514.40x = 507,738,486.21
  5. Step 5: Solve for x
    x = 507,738,486.21/28,514.40
  6. Step 6: Final answer
    x = 17,806.39

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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.