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Finding the Fourth Proportional to 521.79, 719.74 and 347.14

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Solution

The fourth proportional to 521.79, 719.74 and 347.14 is: 478.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.79 : 719.74 = 347.14 : x
  2. Step 2: Convert to fraction form
    521.79/719.74 = 347.14/x
  3. Step 3: Cross multiply
    521.79x = 719.74 × 347.14
  4. Step 4: Simplify right side
    521.79x = 249,850.54
  5. Step 5: Solve for x
    x = 249,850.54/521.79
  6. Step 6: Final answer
    x = 478.83

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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.