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Finding the Fourth Proportional to 3,280.55, 4,920.76 and 815.38

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Solution

The fourth proportional to 3,280.55, 4,920.76 and 815.38 is: 1,223.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,280.55 : 4,920.76 = 815.38 : x
  2. Step 2: Convert to fraction form
    3,280.55/4,920.76 = 815.38/x
  3. Step 3: Cross multiply
    3,280.55x = 4,920.76 × 815.38
  4. Step 4: Simplify right side
    3,280.55x = 4,012,289.29
  5. Step 5: Solve for x
    x = 4,012,289.29/3,280.55
  6. Step 6: Final answer
    x = 1,223.05

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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.