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Finding the Fourth Proportional to 620.45, 929.47 and 345.71

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Solution

The fourth proportional to 620.45, 929.47 and 345.71 is: 517.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.45 : 929.47 = 345.71 : x
  2. Step 2: Convert to fraction form
    620.45/929.47 = 345.71/x
  3. Step 3: Cross multiply
    620.45x = 929.47 × 345.71
  4. Step 4: Simplify right side
    620.45x = 321,327.07
  5. Step 5: Solve for x
    x = 321,327.07/620.45
  6. Step 6: Final answer
    x = 517.89

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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.