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Finding the Fourth Proportional to 7,121.67, 9,828.51 and 3,978.47

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Solution

The fourth proportional to 7,121.67, 9,828.51 and 3,978.47 is: 5,490.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.67 : 9,828.51 = 3,978.47 : x
  2. Step 2: Convert to fraction form
    7,121.67/9,828.51 = 3,978.47/x
  3. Step 3: Cross multiply
    7,121.67x = 9,828.51 × 3,978.47
  4. Step 4: Simplify right side
    7,121.67x = 39,102,420.11
  5. Step 5: Solve for x
    x = 39,102,420.11/7,121.67
  6. Step 6: Final answer
    x = 5,490.62

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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.