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Finding the Fourth Proportional to 762.84, 1,145.34 and 378.36

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Solution

The fourth proportional to 762.84, 1,145.34 and 378.36 is: 568.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.84 : 1,145.34 = 378.36 : x
  2. Step 2: Convert to fraction form
    762.84/1,145.34 = 378.36/x
  3. Step 3: Cross multiply
    762.84x = 1,145.34 × 378.36
  4. Step 4: Simplify right side
    762.84x = 433,350.84
  5. Step 5: Solve for x
    x = 433,350.84/762.84
  6. Step 6: Final answer
    x = 568.08

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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.