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Finding the Fourth Proportional to 509.10, 763.81 and 303.90

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Solution

The fourth proportional to 509.10, 763.81 and 303.90 is: 455.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.10 : 763.81 = 303.90 : x
  2. Step 2: Convert to fraction form
    509.10/763.81 = 303.90/x
  3. Step 3: Cross multiply
    509.10x = 763.81 × 303.90
  4. Step 4: Simplify right side
    509.10x = 232,121.86
  5. Step 5: Solve for x
    x = 232,121.86/509.10
  6. Step 6: Final answer
    x = 455.95

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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.