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Finding the Fourth Proportional to 517.90, 714.21 and 340.55

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Solution

The fourth proportional to 517.90, 714.21 and 340.55 is: 469.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.90 : 714.21 = 340.55 : x
  2. Step 2: Convert to fraction form
    517.90/714.21 = 340.55/x
  3. Step 3: Cross multiply
    517.90x = 714.21 × 340.55
  4. Step 4: Simplify right side
    517.90x = 243,224.22
  5. Step 5: Solve for x
    x = 243,224.22/517.90
  6. Step 6: Final answer
    x = 469.64

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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.