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Finding the Fourth Proportional to 404.04, 558.58 and 386.80

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Solution

The fourth proportional to 404.04, 558.58 and 386.80 is: 534.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.04 : 558.58 = 386.80 : x
  2. Step 2: Convert to fraction form
    404.04/558.58 = 386.80/x
  3. Step 3: Cross multiply
    404.04x = 558.58 × 386.80
  4. Step 4: Simplify right side
    404.04x = 216,058.74
  5. Step 5: Solve for x
    x = 216,058.74/404.04
  6. Step 6: Final answer
    x = 534.75

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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.