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Finding the Fourth Proportional to 682.55, 941.95 and 643.06

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Solution

The fourth proportional to 682.55, 941.95 and 643.06 is: 887.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.55 : 941.95 = 643.06 : x
  2. Step 2: Convert to fraction form
    682.55/941.95 = 643.06/x
  3. Step 3: Cross multiply
    682.55x = 941.95 × 643.06
  4. Step 4: Simplify right side
    682.55x = 605,728.82
  5. Step 5: Solve for x
    x = 605,728.82/682.55
  6. Step 6: Final answer
    x = 887.46

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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.