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Finding the Fourth Proportional to 742.10, 1,115.85 and 623.30

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Solution

The fourth proportional to 742.10, 1,115.85 and 623.30 is: 937.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.10 : 1,115.85 = 623.30 : x
  2. Step 2: Convert to fraction form
    742.10/1,115.85 = 623.30/x
  3. Step 3: Cross multiply
    742.10x = 1,115.85 × 623.30
  4. Step 4: Simplify right side
    742.10x = 695,509.31
  5. Step 5: Solve for x
    x = 695,509.31/742.10
  6. Step 6: Final answer
    x = 937.22

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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.