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Finding the Fourth Proportional to 15,781.61, 21,778.61 and 8,708.03

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Solution

The fourth proportional to 15,781.61, 21,778.61 and 8,708.03 is: 12,017.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.61 : 21,778.61 = 8,708.03 : x
  2. Step 2: Convert to fraction form
    15,781.61/21,778.61 = 8,708.03/x
  3. Step 3: Cross multiply
    15,781.61x = 21,778.61 × 8,708.03
  4. Step 4: Simplify right side
    15,781.61x = 189,648,789.24
  5. Step 5: Solve for x
    x = 189,648,789.24/15,781.61
  6. Step 6: Final answer
    x = 12,017.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.