Home / 21,117.93-29,142.27-11,557.78

Finding the Fourth Proportional to 21,117.93, 29,142.27 and 11,557.78

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Solution

The fourth proportional to 21,117.93, 29,142.27 and 11,557.78 is: 15,949.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,117.93 : 29,142.27 = 11,557.78 : x
  2. Step 2: Convert to fraction form
    21,117.93/29,142.27 = 11,557.78/x
  3. Step 3: Cross multiply
    21,117.93x = 29,142.27 × 11,557.78
  4. Step 4: Simplify right side
    21,117.93x = 336,819,945.36
  5. Step 5: Solve for x
    x = 336,819,945.36/21,117.93
  6. Step 6: Final answer
    x = 15,949.48

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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.