Home / 20,930.78-31,389.90-6,888.21

Finding the Fourth Proportional to 20,930.78, 31,389.90 and 6,888.21

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Solution

The fourth proportional to 20,930.78, 31,389.90 and 6,888.21 is: 10,330.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.78 : 31,389.90 = 6,888.21 : x
  2. Step 2: Convert to fraction form
    20,930.78/31,389.90 = 6,888.21/x
  3. Step 3: Cross multiply
    20,930.78x = 31,389.90 × 6,888.21
  4. Step 4: Simplify right side
    20,930.78x = 216,220,223.08
  5. Step 5: Solve for x
    x = 216,220,223.08/20,930.78
  6. Step 6: Final answer
    x = 10,330.25

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1.5x scale

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.