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Finding the Fourth Proportional to 519.40, 716.72 and 286.51

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Solution

The fourth proportional to 519.40, 716.72 and 286.51 is: 395.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.40 : 716.72 = 286.51 : x
  2. Step 2: Convert to fraction form
    519.40/716.72 = 286.51/x
  3. Step 3: Cross multiply
    519.40x = 716.72 × 286.51
  4. Step 4: Simplify right side
    519.40x = 205,345.30
  5. Step 5: Solve for x
    x = 205,345.30/519.40
  6. Step 6: Final answer
    x = 395.35

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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.