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Finding the Fourth Proportional to 7,280.80, 10,921.20 and 3,585.40

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Solution

The fourth proportional to 7,280.80, 10,921.20 and 3,585.40 is: 5,378.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,280.80 : 10,921.20 = 3,585.40 : x
  2. Step 2: Convert to fraction form
    7,280.80/10,921.20 = 3,585.40/x
  3. Step 3: Cross multiply
    7,280.80x = 10,921.20 × 3,585.40
  4. Step 4: Simplify right side
    7,280.80x = 39,156,870.48
  5. Step 5: Solve for x
    x = 39,156,870.48/7,280.80
  6. Step 6: Final answer
    x = 5,378.10

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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.