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Finding the Fourth Proportional to 7,815.69, 10,721.43 and 7,391.99

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Solution

The fourth proportional to 7,815.69, 10,721.43 and 7,391.99 is: 10,140.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.69 : 10,721.43 = 7,391.99 : x
  2. Step 2: Convert to fraction form
    7,815.69/10,721.43 = 7,391.99/x
  3. Step 3: Cross multiply
    7,815.69x = 10,721.43 × 7,391.99
  4. Step 4: Simplify right side
    7,815.69x = 79,252,730.15
  5. Step 5: Solve for x
    x = 79,252,730.15/7,815.69
  6. Step 6: Final answer
    x = 10,140.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.