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Finding the Fourth Proportional to 929.17, 1,391.82 and 620.11

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Solution

The fourth proportional to 929.17, 1,391.82 and 620.11 is: 928.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.17 : 1,391.82 = 620.11 : x
  2. Step 2: Convert to fraction form
    929.17/1,391.82 = 620.11/x
  3. Step 3: Cross multiply
    929.17x = 1,391.82 × 620.11
  4. Step 4: Simplify right side
    929.17x = 863,081.50
  5. Step 5: Solve for x
    x = 863,081.50/929.17
  6. Step 6: Final answer
    x = 928.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.