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Finding the Fourth Proportional to 7,891.88, 10,890.69 and 4,355

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Solution

The fourth proportional to 7,891.88, 10,890.69 and 4,355 is: 6,009.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,891.88 : 10,890.69 = 4,355 : x
  2. Step 2: Convert to fraction form
    7,891.88/10,890.69 = 4,355/x
  3. Step 3: Cross multiply
    7,891.88x = 10,890.69 × 4,355
  4. Step 4: Simplify right side
    7,891.88x = 47,428,954.95
  5. Step 5: Solve for x
    x = 47,428,954.95/7,891.88
  6. Step 6: Final answer
    x = 6,009.84

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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.