Home / 20,398.24-28,123.28-13,215.36

Finding the Fourth Proportional to 20,398.24, 28,123.28 and 13,215.36

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Solution

The fourth proportional to 20,398.24, 28,123.28 and 13,215.36 is: 18,220.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,398.24 : 28,123.28 = 13,215.36 : x
  2. Step 2: Convert to fraction form
    20,398.24/28,123.28 = 13,215.36/x
  3. Step 3: Cross multiply
    20,398.24x = 28,123.28 × 13,215.36
  4. Step 4: Simplify right side
    20,398.24x = 371,659,269.58
  5. Step 5: Solve for x
    x = 371,659,269.58/20,398.24
  6. Step 6: Final answer
    x = 18,220.16

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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.