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Finding the Fourth Proportional to 7,274.80, 10,912.20 and 4,812.40

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Solution

The fourth proportional to 7,274.80, 10,912.20 and 4,812.40 is: 7,218.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,274.80 : 10,912.20 = 4,812.40 : x
  2. Step 2: Convert to fraction form
    7,274.80/10,912.20 = 4,812.40/x
  3. Step 3: Cross multiply
    7,274.80x = 10,912.20 × 4,812.40
  4. Step 4: Simplify right side
    7,274.80x = 52,513,871.28
  5. Step 5: Solve for x
    x = 52,513,871.28/7,274.80
  6. Step 6: Final answer
    x = 7,218.60

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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.