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Finding the Fourth Proportional to 7,891.90, 10,890.84 and 4,355.12

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Solution

The fourth proportional to 7,891.90, 10,890.84 and 4,355.12 is: 6,010.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,891.90 : 10,890.84 = 4,355.12 : x
  2. Step 2: Convert to fraction form
    7,891.90/10,890.84 = 4,355.12/x
  3. Step 3: Cross multiply
    7,891.90x = 10,890.84 × 4,355.12
  4. Step 4: Simplify right side
    7,891.90x = 47,430,915.10
  5. Step 5: Solve for x
    x = 47,430,915.10/7,891.90
  6. Step 6: Final answer
    x = 6,010.08

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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.