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Finding the Fourth Proportional to 7,920.78, 10,932.68 and 4,935.01

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Solution

The fourth proportional to 7,920.78, 10,932.68 and 4,935.01 is: 6,811.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.78 : 10,932.68 = 4,935.01 : x
  2. Step 2: Convert to fraction form
    7,920.78/10,932.68 = 4,935.01/x
  3. Step 3: Cross multiply
    7,920.78x = 10,932.68 × 4,935.01
  4. Step 4: Simplify right side
    7,920.78x = 53,952,885.13
  5. Step 5: Solve for x
    x = 53,952,885.13/7,920.78
  6. Step 6: Final answer
    x = 6,811.56

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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.