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Finding the Fourth Proportional to 1,009.02, 1,392.80 and 636.62

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Solution

The fourth proportional to 1,009.02, 1,392.80 and 636.62 is: 878.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.02 : 1,392.80 = 636.62 : x
  2. Step 2: Convert to fraction form
    1,009.02/1,392.80 = 636.62/x
  3. Step 3: Cross multiply
    1,009.02x = 1,392.80 × 636.62
  4. Step 4: Simplify right side
    1,009.02x = 886,684.34
  5. Step 5: Solve for x
    x = 886,684.34/1,009.02
  6. Step 6: Final answer
    x = 878.76

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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.