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Finding the Fourth Proportional to 924.78, 1,391.81 and 694.86

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Solution

The fourth proportional to 924.78, 1,391.81 and 694.86 is: 1,045.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    924.78 : 1,391.81 = 694.86 : x
  2. Step 2: Convert to fraction form
    924.78/1,391.81 = 694.86/x
  3. Step 3: Cross multiply
    924.78x = 1,391.81 × 694.86
  4. Step 4: Simplify right side
    924.78x = 967,109.62
  5. Step 5: Solve for x
    x = 967,109.62/924.78
  6. Step 6: Final answer
    x = 1,045.77

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.