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Finding the Fourth Proportional to 762.64, 1,142.98 and 579.48

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Solution

The fourth proportional to 762.64, 1,142.98 and 579.48 is: 868.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.64 : 1,142.98 = 579.48 : x
  2. Step 2: Convert to fraction form
    762.64/1,142.98 = 579.48/x
  3. Step 3: Cross multiply
    762.64x = 1,142.98 × 579.48
  4. Step 4: Simplify right side
    762.64x = 662,334.05
  5. Step 5: Solve for x
    x = 662,334.05/762.64
  6. Step 6: Final answer
    x = 868.48

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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.