Home / 28,285.78-39,017.13-20,338.78

Finding the Fourth Proportional to 28,285.78, 39,017.13 and 20,338.78

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Solution

The fourth proportional to 28,285.78, 39,017.13 and 20,338.78 is: 28,055.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,285.78 : 39,017.13 = 20,338.78 : x
  2. Step 2: Convert to fraction form
    28,285.78/39,017.13 = 20,338.78/x
  3. Step 3: Cross multiply
    28,285.78x = 39,017.13 × 20,338.78
  4. Step 4: Simplify right side
    28,285.78x = 793,560,823.30
  5. Step 5: Solve for x
    x = 793,560,823.30/28,285.78
  6. Step 6: Final answer
    x = 28,055.12

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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.