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Finding the Fourth Proportional to 642.59, 886.76 and 347.85

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Solution

The fourth proportional to 642.59, 886.76 and 347.85 is: 480.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.59 : 886.76 = 347.85 : x
  2. Step 2: Convert to fraction form
    642.59/886.76 = 347.85/x
  3. Step 3: Cross multiply
    642.59x = 886.76 × 347.85
  4. Step 4: Simplify right side
    642.59x = 308,459.47
  5. Step 5: Solve for x
    x = 308,459.47/642.59
  6. Step 6: Final answer
    x = 480.03

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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.