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Finding the Fourth Proportional to 642.78, 887.07 and 363.07

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Solution

The fourth proportional to 642.78, 887.07 and 363.07 is: 501.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.78 : 887.07 = 363.07 : x
  2. Step 2: Convert to fraction form
    642.78/887.07 = 363.07/x
  3. Step 3: Cross multiply
    642.78x = 887.07 × 363.07
  4. Step 4: Simplify right side
    642.78x = 322,068.50
  5. Step 5: Solve for x
    x = 322,068.50/642.78
  6. Step 6: Final answer
    x = 501.06

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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.