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Finding the Fourth Proportional to 507.61, 761.40 and 142.42

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Solution

The fourth proportional to 507.61, 761.40 and 142.42 is: 213.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.61 : 761.40 = 142.42 : x
  2. Step 2: Convert to fraction form
    507.61/761.40 = 142.42/x
  3. Step 3: Cross multiply
    507.61x = 761.40 × 142.42
  4. Step 4: Simplify right side
    507.61x = 108,438.59
  5. Step 5: Solve for x
    x = 108,438.59/507.61
  6. Step 6: Final answer
    x = 213.63

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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.