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Finding the Fourth Proportional to 619.25, 929.75 and 387.47

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Solution

The fourth proportional to 619.25, 929.75 and 387.47 is: 581.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.25 : 929.75 = 387.47 : x
  2. Step 2: Convert to fraction form
    619.25/929.75 = 387.47/x
  3. Step 3: Cross multiply
    619.25x = 929.75 × 387.47
  4. Step 4: Simplify right side
    619.25x = 360,250.62
  5. Step 5: Solve for x
    x = 360,250.62/619.25
  6. Step 6: Final answer
    x = 581.76

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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.