Home / 15,781.49-21,778.40-8,707.91

Finding the Fourth Proportional to 15,781.49, 21,778.40 and 8,707.91

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Solution

The fourth proportional to 15,781.49, 21,778.40 and 8,707.91 is: 12,016.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.49 : 21,778.40 = 8,707.91 : x
  2. Step 2: Convert to fraction form
    15,781.49/21,778.40 = 8,707.91/x
  3. Step 3: Cross multiply
    15,781.49x = 21,778.40 × 8,707.91
  4. Step 4: Simplify right side
    15,781.49x = 189,644,423.36
  5. Step 5: Solve for x
    x = 189,644,423.36/15,781.49
  6. Step 6: Final answer
    x = 12,016.89

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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.