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Finding the Fourth Proportional to 404.16, 555.24 and 388.91

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Solution

The fourth proportional to 404.16, 555.24 and 388.91 is: 534.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.16 : 555.24 = 388.91 : x
  2. Step 2: Convert to fraction form
    404.16/555.24 = 388.91/x
  3. Step 3: Cross multiply
    404.16x = 555.24 × 388.91
  4. Step 4: Simplify right side
    404.16x = 215,935.61
  5. Step 5: Solve for x
    x = 215,935.61/404.16
  6. Step 6: Final answer
    x = 534.28

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.