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Finding the Fourth Proportional to 762.20, 1,142.98 and 372.09

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Solution

The fourth proportional to 762.20, 1,142.98 and 372.09 is: 557.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.20 : 1,142.98 = 372.09 : x
  2. Step 2: Convert to fraction form
    762.20/1,142.98 = 372.09/x
  3. Step 3: Cross multiply
    762.20x = 1,142.98 × 372.09
  4. Step 4: Simplify right side
    762.20x = 425,289.51
  5. Step 5: Solve for x
    x = 425,289.51/762.20
  6. Step 6: Final answer
    x = 557.98

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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.