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Finding the Fourth Proportional to 1,008.90, 1,391.63 and 635.56

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Solution

The fourth proportional to 1,008.90, 1,391.63 and 635.56 is: 876.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.90 : 1,391.63 = 635.56 : x
  2. Step 2: Convert to fraction form
    1,008.90/1,391.63 = 635.56/x
  3. Step 3: Cross multiply
    1,008.90x = 1,391.63 × 635.56
  4. Step 4: Simplify right side
    1,008.90x = 884,457.40
  5. Step 5: Solve for x
    x = 884,457.40/1,008.90
  6. Step 6: Final answer
    x = 876.66

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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.