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Finding the Fourth Proportional to 655.38, 904.47 and 406.71

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Solution

The fourth proportional to 655.38, 904.47 and 406.71 is: 561.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.38 : 904.47 = 406.71 : x
  2. Step 2: Convert to fraction form
    655.38/904.47 = 406.71/x
  3. Step 3: Cross multiply
    655.38x = 904.47 × 406.71
  4. Step 4: Simplify right side
    655.38x = 367,856.99
  5. Step 5: Solve for x
    x = 367,856.99/655.38
  6. Step 6: Final answer
    x = 561.29

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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.