Home / 20,681.28-31,019.32-6,640.20

Finding the Fourth Proportional to 20,681.28, 31,019.32 and 6,640.20

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Solution

The fourth proportional to 20,681.28, 31,019.32 and 6,640.20 is: 9,959.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.28 : 31,019.32 = 6,640.20 : x
  2. Step 2: Convert to fraction form
    20,681.28/31,019.32 = 6,640.20/x
  3. Step 3: Cross multiply
    20,681.28x = 31,019.32 × 6,640.20
  4. Step 4: Simplify right side
    20,681.28x = 205,974,488.66
  5. Step 5: Solve for x
    x = 205,974,488.66/20,681.28
  6. Step 6: Final answer
    x = 9,959.47

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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.