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Finding the Fourth Proportional to 619.60, 931.56 and 519.16

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Solution

The fourth proportional to 619.60, 931.56 and 519.16 is: 780.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.60 : 931.56 = 519.16 : x
  2. Step 2: Convert to fraction form
    619.60/931.56 = 519.16/x
  3. Step 3: Cross multiply
    619.60x = 931.56 × 519.16
  4. Step 4: Simplify right side
    619.60x = 483,628.69
  5. Step 5: Solve for x
    x = 483,628.69/619.60
  6. Step 6: Final answer
    x = 780.55

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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.