Home / 4,778.50-7,167.78-1,315.78

Finding the Fourth Proportional to 4,778.50, 7,167.78 and 1,315.78

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Solution

The fourth proportional to 4,778.50, 7,167.78 and 1,315.78 is: 1,973.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,778.50 : 7,167.78 = 1,315.78 : x
  2. Step 2: Convert to fraction form
    4,778.50/7,167.78 = 1,315.78/x
  3. Step 3: Cross multiply
    4,778.50x = 7,167.78 × 1,315.78
  4. Step 4: Simplify right side
    4,778.50x = 9,431,221.57
  5. Step 5: Solve for x
    x = 9,431,221.57/4,778.50
  6. Step 6: Final answer
    x = 1,973.68

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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.