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Finding the Fourth Proportional to 761.58, 1,143.09 and 415.26

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Solution

The fourth proportional to 761.58, 1,143.09 and 415.26 is: 623.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.58 : 1,143.09 = 415.26 : x
  2. Step 2: Convert to fraction form
    761.58/1,143.09 = 415.26/x
  3. Step 3: Cross multiply
    761.58x = 1,143.09 × 415.26
  4. Step 4: Simplify right side
    761.58x = 474,679.55
  5. Step 5: Solve for x
    x = 474,679.55/761.58
  6. Step 6: Final answer
    x = 623.28

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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.