Home / 15,784.55-21,781.76-9,418.35

Finding the Fourth Proportional to 15,784.55, 21,781.76 and 9,418.35

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Solution

The fourth proportional to 15,784.55, 21,781.76 and 9,418.35 is: 12,996.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,784.55 : 21,781.76 = 9,418.35 : x
  2. Step 2: Convert to fraction form
    15,784.55/21,781.76 = 9,418.35/x
  3. Step 3: Cross multiply
    15,784.55x = 21,781.76 × 9,418.35
  4. Step 4: Simplify right side
    15,784.55x = 205,148,239.30
  5. Step 5: Solve for x
    x = 205,148,239.30/15,784.55
  6. Step 6: Final answer
    x = 12,996.78

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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.