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Finding the Fourth Proportional to 646.79, 892.87 and 381.15

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Solution

The fourth proportional to 646.79, 892.87 and 381.15 is: 526.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.79 : 892.87 = 381.15 : x
  2. Step 2: Convert to fraction form
    646.79/892.87 = 381.15/x
  3. Step 3: Cross multiply
    646.79x = 892.87 × 381.15
  4. Step 4: Simplify right side
    646.79x = 340,315.01
  5. Step 5: Solve for x
    x = 340,315.01/646.79
  6. Step 6: Final answer
    x = 526.16

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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.