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Finding the Fourth Proportional to 1,168.98, 1,613.20 and 637.90

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Solution

The fourth proportional to 1,168.98, 1,613.20 and 637.90 is: 880.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,168.98 : 1,613.20 = 637.90 : x
  2. Step 2: Convert to fraction form
    1,168.98/1,613.20 = 637.90/x
  3. Step 3: Cross multiply
    1,168.98x = 1,613.20 × 637.90
  4. Step 4: Simplify right side
    1,168.98x = 1,029,060.28
  5. Step 5: Solve for x
    x = 1,029,060.28/1,168.98
  6. Step 6: Final answer
    x = 880.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.