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Finding the Fourth Proportional to 509.10, 763.57 and 143.81

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Solution

The fourth proportional to 509.10, 763.57 and 143.81 is: 215.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.10 : 763.57 = 143.81 : x
  2. Step 2: Convert to fraction form
    509.10/763.57 = 143.81/x
  3. Step 3: Cross multiply
    509.10x = 763.57 × 143.81
  4. Step 4: Simplify right side
    509.10x = 109,804.46
  5. Step 5: Solve for x
    x = 109,804.46/509.10
  6. Step 6: Final answer
    x = 215.68

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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.