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Finding the Fourth Proportional to 7,891.61, 10,880.75 and 6,394.01

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Solution

The fourth proportional to 7,891.61, 10,880.75 and 6,394.01 is: 8,815.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,891.61 : 10,880.75 = 6,394.01 : x
  2. Step 2: Convert to fraction form
    7,891.61/10,880.75 = 6,394.01/x
  3. Step 3: Cross multiply
    7,891.61x = 10,880.75 × 6,394.01
  4. Step 4: Simplify right side
    7,891.61x = 69,571,592.34
  5. Step 5: Solve for x
    x = 69,571,592.34/7,891.61
  6. Step 6: Final answer
    x = 8,815.89

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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.