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Finding the Fourth Proportional to 519.16, 777.53 and 287.68

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Solution

The fourth proportional to 519.16, 777.53 and 287.68 is: 430.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.16 : 777.53 = 287.68 : x
  2. Step 2: Convert to fraction form
    519.16/777.53 = 287.68/x
  3. Step 3: Cross multiply
    519.16x = 777.53 × 287.68
  4. Step 4: Simplify right side
    519.16x = 223,678.39
  5. Step 5: Solve for x
    x = 223,678.39/519.16
  6. Step 6: Final answer
    x = 430.85

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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.