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Finding the Fourth Proportional to 1,008.39, 1,390.93 and 635.05

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Solution

The fourth proportional to 1,008.39, 1,390.93 and 635.05 is: 875.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.39 : 1,390.93 = 635.05 : x
  2. Step 2: Convert to fraction form
    1,008.39/1,390.93 = 635.05/x
  3. Step 3: Cross multiply
    1,008.39x = 1,390.93 × 635.05
  4. Step 4: Simplify right side
    1,008.39x = 883,310.10
  5. Step 5: Solve for x
    x = 883,310.10/1,008.39
  6. Step 6: Final answer
    x = 875.96

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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.