Home / 20,885.28-31,328.28-9,785.88

Finding the Fourth Proportional to 20,885.28, 31,328.28 and 9,785.88

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Solution

The fourth proportional to 20,885.28, 31,328.28 and 9,785.88 is: 14,678.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.28 : 31,328.28 = 9,785.88 : x
  2. Step 2: Convert to fraction form
    20,885.28/31,328.28 = 9,785.88/x
  3. Step 3: Cross multiply
    20,885.28x = 31,328.28 × 9,785.88
  4. Step 4: Simplify right side
    20,885.28x = 306,574,788.69
  5. Step 5: Solve for x
    x = 306,574,788.69/20,885.28
  6. Step 6: Final answer
    x = 14,678.99

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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.