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Finding the Fourth Proportional to 762.12, 1,142.29 and 675.62

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Solution

The fourth proportional to 762.12, 1,142.29 and 675.62 is: 1,012.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.12 : 1,142.29 = 675.62 : x
  2. Step 2: Convert to fraction form
    762.12/1,142.29 = 675.62/x
  3. Step 3: Cross multiply
    762.12x = 1,142.29 × 675.62
  4. Step 4: Simplify right side
    762.12x = 771,750.85
  5. Step 5: Solve for x
    x = 771,750.85/762.12
  6. Step 6: Final answer
    x = 1,012.64

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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.