Home / 20,871.54-28,802.55-11,440.08

Finding the Fourth Proportional to 20,871.54, 28,802.55 and 11,440.08

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Solution

The fourth proportional to 20,871.54, 28,802.55 and 11,440.08 is: 15,787.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.54 : 28,802.55 = 11,440.08 : x
  2. Step 2: Convert to fraction form
    20,871.54/28,802.55 = 11,440.08/x
  3. Step 3: Cross multiply
    20,871.54x = 28,802.55 × 11,440.08
  4. Step 4: Simplify right side
    20,871.54x = 329,503,476.20
  5. Step 5: Solve for x
    x = 329,503,476.20/20,871.54
  6. Step 6: Final answer
    x = 15,787.21

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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.