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Finding the Fourth Proportional to 7,740.70, 11,639.08 and 7,131.76

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Solution

The fourth proportional to 7,740.70, 11,639.08 and 7,131.76 is: 10,723.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,740.70 : 11,639.08 = 7,131.76 : x
  2. Step 2: Convert to fraction form
    7,740.70/11,639.08 = 7,131.76/x
  3. Step 3: Cross multiply
    7,740.70x = 11,639.08 × 7,131.76
  4. Step 4: Simplify right side
    7,740.70x = 83,007,125.18
  5. Step 5: Solve for x
    x = 83,007,125.18/7,740.70
  6. Step 6: Final answer
    x = 10,723.46

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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.