Home / 20,705.78-31,058.93-5,915.18

Finding the Fourth Proportional to 20,705.78, 31,058.93 and 5,915.18

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Solution

The fourth proportional to 20,705.78, 31,058.93 and 5,915.18 is: 8,872.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,705.78 : 31,058.93 = 5,915.18 : x
  2. Step 2: Convert to fraction form
    20,705.78/31,058.93 = 5,915.18/x
  3. Step 3: Cross multiply
    20,705.78x = 31,058.93 × 5,915.18
  4. Step 4: Simplify right side
    20,705.78x = 183,719,021.05
  5. Step 5: Solve for x
    x = 183,719,021.05/20,705.78
  6. Step 6: Final answer
    x = 8,872.84

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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.