Home / 31,028.52-42,808.86-20,428.86

Finding the Fourth Proportional to 31,028.52, 42,808.86 and 20,428.86

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Solution

The fourth proportional to 31,028.52, 42,808.86 and 20,428.86 is: 28,184.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,028.52 : 42,808.86 = 20,428.86 : x
  2. Step 2: Convert to fraction form
    31,028.52/42,808.86 = 20,428.86/x
  3. Step 3: Cross multiply
    31,028.52x = 42,808.86 × 20,428.86
  4. Step 4: Simplify right side
    31,028.52x = 874,536,207.70
  5. Step 5: Solve for x
    x = 874,536,207.70/31,028.52
  6. Step 6: Final answer
    x = 28,184.92

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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.