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Finding the Fourth Proportional to 480.15, 661.98 and 355.59

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Solution

The fourth proportional to 480.15, 661.98 and 355.59 is: 490.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.15 : 661.98 = 355.59 : x
  2. Step 2: Convert to fraction form
    480.15/661.98 = 355.59/x
  3. Step 3: Cross multiply
    480.15x = 661.98 × 355.59
  4. Step 4: Simplify right side
    480.15x = 235,393.47
  5. Step 5: Solve for x
    x = 235,393.47/480.15
  6. Step 6: Final answer
    x = 490.25

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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.