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Finding the Fourth Proportional to 646.66, 892.41 and 384.71

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Solution

The fourth proportional to 646.66, 892.41 and 384.71 is: 530.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.66 : 892.41 = 384.71 : x
  2. Step 2: Convert to fraction form
    646.66/892.41 = 384.71/x
  3. Step 3: Cross multiply
    646.66x = 892.41 × 384.71
  4. Step 4: Simplify right side
    646.66x = 343,319.05
  5. Step 5: Solve for x
    x = 343,319.05/646.66
  6. Step 6: Final answer
    x = 530.92

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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.