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Finding the Fourth Proportional to 507.57, 761.30 and 142.39

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Solution

The fourth proportional to 507.57, 761.30 and 142.39 is: 213.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.57 : 761.30 = 142.39 : x
  2. Step 2: Convert to fraction form
    507.57/761.30 = 142.39/x
  3. Step 3: Cross multiply
    507.57x = 761.30 × 142.39
  4. Step 4: Simplify right side
    507.57x = 108,402.28
  5. Step 5: Solve for x
    x = 108,402.28/507.57
  6. Step 6: Final answer
    x = 213.57

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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.