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Finding the Fourth Proportional to 646.40, 892.18 and 384.56

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Solution

The fourth proportional to 646.40, 892.18 and 384.56 is: 530.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.40 : 892.18 = 384.56 : x
  2. Step 2: Convert to fraction form
    646.40/892.18 = 384.56/x
  3. Step 3: Cross multiply
    646.40x = 892.18 × 384.56
  4. Step 4: Simplify right side
    646.40x = 343,096.74
  5. Step 5: Solve for x
    x = 343,096.74/646.40
  6. Step 6: Final answer
    x = 530.78

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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.