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Finding the Fourth Proportional to 643.38, 887.43 and 468.42

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Solution

The fourth proportional to 643.38, 887.43 and 468.42 is: 646.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.38 : 887.43 = 468.42 : x
  2. Step 2: Convert to fraction form
    643.38/887.43 = 468.42/x
  3. Step 3: Cross multiply
    643.38x = 887.43 × 468.42
  4. Step 4: Simplify right side
    643.38x = 415,689.96
  5. Step 5: Solve for x
    x = 415,689.96/643.38
  6. Step 6: Final answer
    x = 646.10

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Double scale
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Similar ratio
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1.5x scale

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.