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Finding the Fourth Proportional to 762.84, 1,143.16 and 415.88

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Solution

The fourth proportional to 762.84, 1,143.16 and 415.88 is: 623.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.84 : 1,143.16 = 415.88 : x
  2. Step 2: Convert to fraction form
    762.84/1,143.16 = 415.88/x
  3. Step 3: Cross multiply
    762.84x = 1,143.16 × 415.88
  4. Step 4: Simplify right side
    762.84x = 475,417.38
  5. Step 5: Solve for x
    x = 475,417.38/762.84
  6. Step 6: Final answer
    x = 623.22

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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.