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Finding the Fourth Proportional to 655.70, 905.51 and 555.19

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Solution

The fourth proportional to 655.70, 905.51 and 555.19 is: 766.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.70 : 905.51 = 555.19 : x
  2. Step 2: Convert to fraction form
    655.70/905.51 = 555.19/x
  3. Step 3: Cross multiply
    655.70x = 905.51 × 555.19
  4. Step 4: Simplify right side
    655.70x = 502,729.22
  5. Step 5: Solve for x
    x = 502,729.22/655.70
  6. Step 6: Final answer
    x = 766.71

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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.