Home / 21,001.42-28,981.74-11,569.78

Finding the Fourth Proportional to 21,001.42, 28,981.74 and 11,569.78

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Solution

The fourth proportional to 21,001.42, 28,981.74 and 11,569.78 is: 15,966.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,001.42 : 28,981.74 = 11,569.78 : x
  2. Step 2: Convert to fraction form
    21,001.42/28,981.74 = 11,569.78/x
  3. Step 3: Cross multiply
    21,001.42x = 28,981.74 × 11,569.78
  4. Step 4: Simplify right side
    21,001.42x = 335,312,355.82
  5. Step 5: Solve for x
    x = 335,312,355.82/21,001.42
  6. Step 6: Final answer
    x = 15,966.18

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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.