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Finding the Fourth Proportional to 1,079.75, 1,490.10 and 638.03

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Solution

The fourth proportional to 1,079.75, 1,490.10 and 638.03 is: 880.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.75 : 1,490.10 = 638.03 : x
  2. Step 2: Convert to fraction form
    1,079.75/1,490.10 = 638.03/x
  3. Step 3: Cross multiply
    1,079.75x = 1,490.10 × 638.03
  4. Step 4: Simplify right side
    1,079.75x = 950,728.50
  5. Step 5: Solve for x
    x = 950,728.50/1,079.75
  6. Step 6: Final answer
    x = 880.51

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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.