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Finding the Fourth Proportional to 7,891.72, 10,890.66 and 4,354.99

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Solution

The fourth proportional to 7,891.72, 10,890.66 and 4,354.99 is: 6,009.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,891.72 : 10,890.66 = 4,354.99 : x
  2. Step 2: Convert to fraction form
    7,891.72/10,890.66 = 4,354.99/x
  3. Step 3: Cross multiply
    7,891.72x = 10,890.66 × 4,354.99
  4. Step 4: Simplify right side
    7,891.72x = 47,428,715.39
  5. Step 5: Solve for x
    x = 47,428,715.39/7,891.72
  6. Step 6: Final answer
    x = 6,009.93

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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.