Home / 20,871.30-28,802.18-11,439.78

Finding the Fourth Proportional to 20,871.30, 28,802.18 and 11,439.78

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Solution

The fourth proportional to 20,871.30, 28,802.18 and 11,439.78 is: 15,786.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.30 : 28,802.18 = 11,439.78 : x
  2. Step 2: Convert to fraction form
    20,871.30/28,802.18 = 11,439.78/x
  3. Step 3: Cross multiply
    20,871.30x = 28,802.18 × 11,439.78
  4. Step 4: Simplify right side
    20,871.30x = 329,490,602.72
  5. Step 5: Solve for x
    x = 329,490,602.72/20,871.30
  6. Step 6: Final answer
    x = 15,786.78

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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.