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Finding the Fourth Proportional to 643.30, 887.30 and 453.94

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Solution

The fourth proportional to 643.30, 887.30 and 453.94 is: 626.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.30 : 887.30 = 453.94 : x
  2. Step 2: Convert to fraction form
    643.30/887.30 = 453.94/x
  3. Step 3: Cross multiply
    643.30x = 887.30 × 453.94
  4. Step 4: Simplify right side
    643.30x = 402,778.69
  5. Step 5: Solve for x
    x = 402,778.69/643.30
  6. Step 6: Final answer
    x = 626.11

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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.