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Finding the Fourth Proportional to 519.40, 716.85 and 320.35

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Solution

The fourth proportional to 519.40, 716.85 and 320.35 is: 442.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.40 : 716.85 = 320.35 : x
  2. Step 2: Convert to fraction form
    519.40/716.85 = 320.35/x
  3. Step 3: Cross multiply
    519.40x = 716.85 × 320.35
  4. Step 4: Simplify right side
    519.40x = 229,641.91
  5. Step 5: Solve for x
    x = 229,641.91/519.40
  6. Step 6: Final answer
    x = 442.13

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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.