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Finding the Fourth Proportional to 646.20, 966.90 and 386.34

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Solution

The fourth proportional to 646.20, 966.90 and 386.34 is: 578.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.20 : 966.90 = 386.34 : x
  2. Step 2: Convert to fraction form
    646.20/966.90 = 386.34/x
  3. Step 3: Cross multiply
    646.20x = 966.90 × 386.34
  4. Step 4: Simplify right side
    646.20x = 373,552.15
  5. Step 5: Solve for x
    x = 373,552.15/646.20
  6. Step 6: Final answer
    x = 578.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.