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Finding the Fourth Proportional to 931.30, 1,395.14 and 519.20

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Solution

The fourth proportional to 931.30, 1,395.14 and 519.20 is: 777.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.30 : 1,395.14 = 519.20 : x
  2. Step 2: Convert to fraction form
    931.30/1,395.14 = 519.20/x
  3. Step 3: Cross multiply
    931.30x = 1,395.14 × 519.20
  4. Step 4: Simplify right side
    931.30x = 724,356.69
  5. Step 5: Solve for x
    x = 724,356.69/931.30
  6. Step 6: Final answer
    x = 777.79

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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.