Home / 21,108.06-29,128.78-11,547.75

Finding the Fourth Proportional to 21,108.06, 29,128.78 and 11,547.75

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Solution

The fourth proportional to 21,108.06, 29,128.78 and 11,547.75 is: 15,935.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.06 : 29,128.78 = 11,547.75 : x
  2. Step 2: Convert to fraction form
    21,108.06/29,128.78 = 11,547.75/x
  3. Step 3: Cross multiply
    21,108.06x = 29,128.78 × 11,547.75
  4. Step 4: Simplify right side
    21,108.06x = 336,371,869.25
  5. Step 5: Solve for x
    x = 336,371,869.25/21,108.06
  6. Step 6: Final answer
    x = 15,935.71

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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.