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Finding the Fourth Proportional to 646.11, 891.68 and 384.21

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Solution

The fourth proportional to 646.11, 891.68 and 384.21 is: 530.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.11 : 891.68 = 384.21 : x
  2. Step 2: Convert to fraction form
    646.11/891.68 = 384.21/x
  3. Step 3: Cross multiply
    646.11x = 891.68 × 384.21
  4. Step 4: Simplify right side
    646.11x = 342,590.45
  5. Step 5: Solve for x
    x = 342,590.45/646.11
  6. Step 6: Final answer
    x = 530.24

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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.