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Finding the Fourth Proportional to 15,398.80, 21,339.61 and 15,103.48

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Solution

The fourth proportional to 15,398.80, 21,339.61 and 15,103.48 is: 20,930.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,398.80 : 21,339.61 = 15,103.48 : x
  2. Step 2: Convert to fraction form
    15,398.80/21,339.61 = 15,103.48/x
  3. Step 3: Cross multiply
    15,398.80x = 21,339.61 × 15,103.48
  4. Step 4: Simplify right side
    15,398.80x = 322,302,372.84
  5. Step 5: Solve for x
    x = 322,302,372.84/15,398.80
  6. Step 6: Final answer
    x = 20,930.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.