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Finding the Fourth Proportional to 404.87, 558.90 and 393.93

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Solution

The fourth proportional to 404.87, 558.90 and 393.93 is: 543.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.87 : 558.90 = 393.93 : x
  2. Step 2: Convert to fraction form
    404.87/558.90 = 393.93/x
  3. Step 3: Cross multiply
    404.87x = 558.90 × 393.93
  4. Step 4: Simplify right side
    404.87x = 220,167.48
  5. Step 5: Solve for x
    x = 220,167.48/404.87
  6. Step 6: Final answer
    x = 543.80

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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.