Home / 20,871.28-28,802.37-11,440.45

Finding the Fourth Proportional to 20,871.28, 28,802.37 and 11,440.45

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Solution

The fourth proportional to 20,871.28, 28,802.37 and 11,440.45 is: 15,787.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.28 : 28,802.37 = 11,440.45 : x
  2. Step 2: Convert to fraction form
    20,871.28/28,802.37 = 11,440.45/x
  3. Step 3: Cross multiply
    20,871.28x = 28,802.37 × 11,440.45
  4. Step 4: Simplify right side
    20,871.28x = 329,512,152.77
  5. Step 5: Solve for x
    x = 329,512,152.77/20,871.28
  6. Step 6: Final answer
    x = 15,787.83

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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.