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Finding the Fourth Proportional to 7,613.80, 11,420.70 and 7,191.40

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Solution

The fourth proportional to 7,613.80, 11,420.70 and 7,191.40 is: 10,787.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,613.80 : 11,420.70 = 7,191.40 : x
  2. Step 2: Convert to fraction form
    7,613.80/11,420.70 = 7,191.40/x
  3. Step 3: Cross multiply
    7,613.80x = 11,420.70 × 7,191.40
  4. Step 4: Simplify right side
    7,613.80x = 82,130,821.98
  5. Step 5: Solve for x
    x = 82,130,821.98/7,613.80
  6. Step 6: Final answer
    x = 10,787.10

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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.