Home / 20,987.28-31,491.84-9,297.75

Finding the Fourth Proportional to 20,987.28, 31,491.84 and 9,297.75

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Solution

The fourth proportional to 20,987.28, 31,491.84 and 9,297.75 is: 13,951.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.28 : 31,491.84 = 9,297.75 : x
  2. Step 2: Convert to fraction form
    20,987.28/31,491.84 = 9,297.75/x
  3. Step 3: Cross multiply
    20,987.28x = 31,491.84 × 9,297.75
  4. Step 4: Simplify right side
    20,987.28x = 292,803,255.36
  5. Step 5: Solve for x
    x = 292,803,255.36/20,987.28
  6. Step 6: Final answer
    x = 13,951.46

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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.