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Finding the Fourth Proportional to 28,010.61, 42,021.99 and 8,290.55

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Solution

The fourth proportional to 28,010.61, 42,021.99 and 8,290.55 is: 12,437.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,010.61 : 42,021.99 = 8,290.55 : x
  2. Step 2: Convert to fraction form
    28,010.61/42,021.99 = 8,290.55/x
  3. Step 3: Cross multiply
    28,010.61x = 42,021.99 × 8,290.55
  4. Step 4: Simplify right side
    28,010.61x = 348,385,514.25
  5. Step 5: Solve for x
    x = 348,385,514.25/28,010.61
  6. Step 6: Final answer
    x = 12,437.63

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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.