Home / 21,022.32-31,531.04-5,438.72

Finding the Fourth Proportional to 21,022.32, 31,531.04 and 5,438.72

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Solution

The fourth proportional to 21,022.32, 31,531.04 and 5,438.72 is: 8,157.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,022.32 : 31,531.04 = 5,438.72 : x
  2. Step 2: Convert to fraction form
    21,022.32/31,531.04 = 5,438.72/x
  3. Step 3: Cross multiply
    21,022.32x = 31,531.04 × 5,438.72
  4. Step 4: Simplify right side
    21,022.32x = 171,488,497.87
  5. Step 5: Solve for x
    x = 171,488,497.87/21,022.32
  6. Step 6: Final answer
    x = 8,157.45

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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.