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Finding the Fourth Proportional to 404.88, 558.65 and 257.70

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Solution

The fourth proportional to 404.88, 558.65 and 257.70 is: 355.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.88 : 558.65 = 257.70 : x
  2. Step 2: Convert to fraction form
    404.88/558.65 = 257.70/x
  3. Step 3: Cross multiply
    404.88x = 558.65 × 257.70
  4. Step 4: Simplify right side
    404.88x = 143,962.82
  5. Step 5: Solve for x
    x = 143,962.82/404.88
  6. Step 6: Final answer
    x = 355.57

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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.