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Finding the Fourth Proportional to 492.77, 739.61 and 391.17

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Solution

The fourth proportional to 492.77, 739.61 and 391.17 is: 587.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.77 : 739.61 = 391.17 : x
  2. Step 2: Convert to fraction form
    492.77/739.61 = 391.17/x
  3. Step 3: Cross multiply
    492.77x = 739.61 × 391.17
  4. Step 4: Simplify right side
    492.77x = 289,313.24
  5. Step 5: Solve for x
    x = 289,313.24/492.77
  6. Step 6: Final answer
    x = 587.12

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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.