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Finding the Fourth Proportional to 680.67, 938.12 and 555.53

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Solution

The fourth proportional to 680.67, 938.12 and 555.53 is: 765.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.67 : 938.12 = 555.53 : x
  2. Step 2: Convert to fraction form
    680.67/938.12 = 555.53/x
  3. Step 3: Cross multiply
    680.67x = 938.12 × 555.53
  4. Step 4: Simplify right side
    680.67x = 521,146.34
  5. Step 5: Solve for x
    x = 521,146.34/680.67
  6. Step 6: Final answer
    x = 765.64

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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.