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Finding the Fourth Proportional to 7,621.84, 10,520.18 and 7,157.17

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Solution

The fourth proportional to 7,621.84, 10,520.18 and 7,157.17 is: 9,878.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,621.84 : 10,520.18 = 7,157.17 : x
  2. Step 2: Convert to fraction form
    7,621.84/10,520.18 = 7,157.17/x
  3. Step 3: Cross multiply
    7,621.84x = 10,520.18 × 7,157.17
  4. Step 4: Simplify right side
    7,621.84x = 75,294,716.69
  5. Step 5: Solve for x
    x = 75,294,716.69/7,621.84
  6. Step 6: Final answer
    x = 9,878.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.