Home / 20,871.47-28,802.79-11,440.04

Finding the Fourth Proportional to 20,871.47, 28,802.79 and 11,440.04

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Solution

The fourth proportional to 20,871.47, 28,802.79 and 11,440.04 is: 15,787.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.47 : 28,802.79 = 11,440.04 : x
  2. Step 2: Convert to fraction form
    20,871.47/28,802.79 = 11,440.04/x
  3. Step 3: Cross multiply
    20,871.47x = 28,802.79 × 11,440.04
  4. Step 4: Simplify right side
    20,871.47x = 329,504,925.70
  5. Step 5: Solve for x
    x = 329,504,925.70/20,871.47
  6. Step 6: Final answer
    x = 15,787.33

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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.