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Finding the Fourth Proportional to 373.90, 515.90 and 208.08

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Solution

The fourth proportional to 373.90, 515.90 and 208.08 is: 287.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    373.90 : 515.90 = 208.08 : x
  2. Step 2: Convert to fraction form
    373.90/515.90 = 208.08/x
  3. Step 3: Cross multiply
    373.90x = 515.90 × 208.08
  4. Step 4: Simplify right side
    373.90x = 107,348.47
  5. Step 5: Solve for x
    x = 107,348.47/373.90
  6. Step 6: Final answer
    x = 287.10

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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.