Home / 15,743.76-21,728.16-9,781.08

Finding the Fourth Proportional to 15,743.76, 21,728.16 and 9,781.08

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Solution

The fourth proportional to 15,743.76, 21,728.16 and 9,781.08 is: 13,498.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,743.76 : 21,728.16 = 9,781.08 : x
  2. Step 2: Convert to fraction form
    15,743.76/21,728.16 = 9,781.08/x
  3. Step 3: Cross multiply
    15,743.76x = 21,728.16 × 9,781.08
  4. Step 4: Simplify right side
    15,743.76x = 212,524,871.21
  5. Step 5: Solve for x
    x = 212,524,871.21/15,743.76
  6. Step 6: Final answer
    x = 13,498.99

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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.