Home / 19,871.29-27,420.18-15,890.95

Finding the Fourth Proportional to 19,871.29, 27,420.18 and 15,890.95

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Solution

The fourth proportional to 19,871.29, 27,420.18 and 15,890.95 is: 21,927.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,871.29 : 27,420.18 = 15,890.95 : x
  2. Step 2: Convert to fraction form
    19,871.29/27,420.18 = 15,890.95/x
  3. Step 3: Cross multiply
    19,871.29x = 27,420.18 × 15,890.95
  4. Step 4: Simplify right side
    19,871.29x = 435,732,709.37
  5. Step 5: Solve for x
    x = 435,732,709.37/19,871.29
  6. Step 6: Final answer
    x = 21,927.75

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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.