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Finding the Fourth Proportional to 655.86, 905.51 and 407.54

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Solution

The fourth proportional to 655.86, 905.51 and 407.54 is: 562.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.86 : 905.51 = 407.54 : x
  2. Step 2: Convert to fraction form
    655.86/905.51 = 407.54/x
  3. Step 3: Cross multiply
    655.86x = 905.51 × 407.54
  4. Step 4: Simplify right side
    655.86x = 369,027.24
  5. Step 5: Solve for x
    x = 369,027.24/655.86
  6. Step 6: Final answer
    x = 562.66

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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.