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Finding the Fourth Proportional to 456.85, 630.46 and 279.81

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Solution

The fourth proportional to 456.85, 630.46 and 279.81 is: 386.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.85 : 630.46 = 279.81 : x
  2. Step 2: Convert to fraction form
    456.85/630.46 = 279.81/x
  3. Step 3: Cross multiply
    456.85x = 630.46 × 279.81
  4. Step 4: Simplify right side
    456.85x = 176,409.01
  5. Step 5: Solve for x
    x = 176,409.01/456.85
  6. Step 6: Final answer
    x = 386.14

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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.