Home / 21,118.76-31,686.62-9,424.04

Finding the Fourth Proportional to 21,118.76, 31,686.62 and 9,424.04

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Solution

The fourth proportional to 21,118.76, 31,686.62 and 9,424.04 is: 14,139.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.76 : 31,686.62 = 9,424.04 : x
  2. Step 2: Convert to fraction form
    21,118.76/31,686.62 = 9,424.04/x
  3. Step 3: Cross multiply
    21,118.76x = 31,686.62 × 9,424.04
  4. Step 4: Simplify right side
    21,118.76x = 298,615,974.34
  5. Step 5: Solve for x
    x = 298,615,974.34/21,118.76
  6. Step 6: Final answer
    x = 14,139.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.