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Finding the Fourth Proportional to 517.58, 714.18 and 307.76

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Solution

The fourth proportional to 517.58, 714.18 and 307.76 is: 424.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.58 : 714.18 = 307.76 : x
  2. Step 2: Convert to fraction form
    517.58/714.18 = 307.76/x
  3. Step 3: Cross multiply
    517.58x = 714.18 × 307.76
  4. Step 4: Simplify right side
    517.58x = 219,792.47
  5. Step 5: Solve for x
    x = 219,792.47/517.58
  6. Step 6: Final answer
    x = 424.66

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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.