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Finding the Fourth Proportional to 1,007.60, 1,391.37 and 635.20

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Solution

The fourth proportional to 1,007.60, 1,391.37 and 635.20 is: 877.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.60 : 1,391.37 = 635.20 : x
  2. Step 2: Convert to fraction form
    1,007.60/1,391.37 = 635.20/x
  3. Step 3: Cross multiply
    1,007.60x = 1,391.37 × 635.20
  4. Step 4: Simplify right side
    1,007.60x = 883,794.75
  5. Step 5: Solve for x
    x = 883,794.75/1,007.60
  6. Step 6: Final answer
    x = 877.13

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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.