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Finding the Fourth Proportional to 492.11, 678.87 and 457.28

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Solution

The fourth proportional to 492.11, 678.87 and 457.28 is: 630.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.11 : 678.87 = 457.28 : x
  2. Step 2: Convert to fraction form
    492.11/678.87 = 457.28/x
  3. Step 3: Cross multiply
    492.11x = 678.87 × 457.28
  4. Step 4: Simplify right side
    492.11x = 310,430.28
  5. Step 5: Solve for x
    x = 310,430.28/492.11
  6. Step 6: Final answer
    x = 630.82

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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.