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Finding the Fourth Proportional to 655.88, 905.27 and 407.05

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Solution

The fourth proportional to 655.88, 905.27 and 407.05 is: 561.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.88 : 905.27 = 407.05 : x
  2. Step 2: Convert to fraction form
    655.88/905.27 = 407.05/x
  3. Step 3: Cross multiply
    655.88x = 905.27 × 407.05
  4. Step 4: Simplify right side
    655.88x = 368,490.15
  5. Step 5: Solve for x
    x = 368,490.15/655.88
  6. Step 6: Final answer
    x = 561.83

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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.