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Finding the Fourth Proportional to 7,910.40, 11,894.40 and 6,643.20

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Solution

The fourth proportional to 7,910.40, 11,894.40 and 6,643.20 is: 9,988.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,910.40 : 11,894.40 = 6,643.20 : x
  2. Step 2: Convert to fraction form
    7,910.40/11,894.40 = 6,643.20/x
  3. Step 3: Cross multiply
    7,910.40x = 11,894.40 × 6,643.20
  4. Step 4: Simplify right side
    7,910.40x = 79,016,878.08
  5. Step 5: Solve for x
    x = 79,016,878.08/7,910.40
  6. Step 6: Final answer
    x = 9,988.99

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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.