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Finding the Fourth Proportional to 15,859.13, 21,885.39 and 9,890.37

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Solution

The fourth proportional to 15,859.13, 21,885.39 and 9,890.37 is: 13,648.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,859.13 : 21,885.39 = 9,890.37 : x
  2. Step 2: Convert to fraction form
    15,859.13/21,885.39 = 9,890.37/x
  3. Step 3: Cross multiply
    15,859.13x = 21,885.39 × 9,890.37
  4. Step 4: Simplify right side
    15,859.13x = 216,454,604.69
  5. Step 5: Solve for x
    x = 216,454,604.69/15,859.13
  6. Step 6: Final answer
    x = 13,648.58

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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.