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Finding the Fourth Proportional to 345.88, 517.59 and 215.77

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Solution

The fourth proportional to 345.88, 517.59 and 215.77 is: 322.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.88 : 517.59 = 215.77 : x
  2. Step 2: Convert to fraction form
    345.88/517.59 = 215.77/x
  3. Step 3: Cross multiply
    345.88x = 517.59 × 215.77
  4. Step 4: Simplify right side
    345.88x = 111,680.07
  5. Step 5: Solve for x
    x = 111,680.07/345.88
  6. Step 6: Final answer
    x = 322.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.