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Finding the Fourth Proportional to 740.72, 1,103.78 and 692.12

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Solution

The fourth proportional to 740.72, 1,103.78 and 692.12 is: 1,031.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.72 : 1,103.78 = 692.12 : x
  2. Step 2: Convert to fraction form
    740.72/1,103.78 = 692.12/x
  3. Step 3: Cross multiply
    740.72x = 1,103.78 × 692.12
  4. Step 4: Simplify right side
    740.72x = 763,948.21
  5. Step 5: Solve for x
    x = 763,948.21/740.72
  6. Step 6: Final answer
    x = 1,031.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.