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Finding the Fourth Proportional to 509.01, 763.42 and 143.71

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Solution

The fourth proportional to 509.01, 763.42 and 143.71 is: 215.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.01 : 763.42 = 143.71 : x
  2. Step 2: Convert to fraction form
    509.01/763.42 = 143.71/x
  3. Step 3: Cross multiply
    509.01x = 763.42 × 143.71
  4. Step 4: Simplify right side
    509.01x = 109,709.36
  5. Step 5: Solve for x
    x = 109,709.36/509.01
  6. Step 6: Final answer
    x = 215.54

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Double scale
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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.