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Finding the Fourth Proportional to 90,357.84, 135,554.88 and 31,195.68

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Solution

The fourth proportional to 90,357.84, 135,554.88 and 31,195.68 is: 46,799.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,357.84 : 135,554.88 = 31,195.68 : x
  2. Step 2: Convert to fraction form
    90,357.84/135,554.88 = 31,195.68/x
  3. Step 3: Cross multiply
    90,357.84x = 135,554.88 × 31,195.68
  4. Step 4: Simplify right side
    90,357.84x = 4,228,726,658.92
  5. Step 5: Solve for x
    x = 4,228,726,658.92/90,357.84
  6. Step 6: Final answer
    x = 46,799.78

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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.