Home / 28,635.78-39,499.20-20,689.68

Finding the Fourth Proportional to 28,635.78, 39,499.20 and 20,689.68

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Solution

The fourth proportional to 28,635.78, 39,499.20 and 20,689.68 is: 28,538.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,635.78 : 39,499.20 = 20,689.68 : x
  2. Step 2: Convert to fraction form
    28,635.78/39,499.20 = 20,689.68/x
  3. Step 3: Cross multiply
    28,635.78x = 39,499.20 × 20,689.68
  4. Step 4: Simplify right side
    28,635.78x = 817,225,808.26
  5. Step 5: Solve for x
    x = 817,225,808.26/28,635.78
  6. Step 6: Final answer
    x = 28,538.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.