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Finding the Fourth Proportional to 646.12, 891.38 and 383.88

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Solution

The fourth proportional to 646.12, 891.38 and 383.88 is: 529.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.12 : 891.38 = 383.88 : x
  2. Step 2: Convert to fraction form
    646.12/891.38 = 383.88/x
  3. Step 3: Cross multiply
    646.12x = 891.38 × 383.88
  4. Step 4: Simplify right side
    646.12x = 342,182.95
  5. Step 5: Solve for x
    x = 342,182.95/646.12
  6. Step 6: Final answer
    x = 529.60

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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.