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Finding the Fourth Proportional to 7,280.80, 10,917.76 and 4,358.40

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Solution

The fourth proportional to 7,280.80, 10,917.76 and 4,358.40 is: 6,535.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,280.80 : 10,917.76 = 4,358.40 : x
  2. Step 2: Convert to fraction form
    7,280.80/10,917.76 = 4,358.40/x
  3. Step 3: Cross multiply
    7,280.80x = 10,917.76 × 4,358.40
  4. Step 4: Simplify right side
    7,280.80x = 47,583,965.18
  5. Step 5: Solve for x
    x = 47,583,965.18/7,280.80
  6. Step 6: Final answer
    x = 6,535.54

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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.