Home / 21,055.62-31,585.11-12,291.42

Finding the Fourth Proportional to 21,055.62, 31,585.11 and 12,291.42

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Solution

The fourth proportional to 21,055.62, 31,585.11 and 12,291.42 is: 18,438.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,055.62 : 31,585.11 = 12,291.42 : x
  2. Step 2: Convert to fraction form
    21,055.62/31,585.11 = 12,291.42/x
  3. Step 3: Cross multiply
    21,055.62x = 31,585.11 × 12,291.42
  4. Step 4: Simplify right side
    21,055.62x = 388,225,852.76
  5. Step 5: Solve for x
    x = 388,225,852.76/21,055.62
  6. Step 6: Final answer
    x = 18,438.11

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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.