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Finding the Fourth Proportional to 1,231.38, 1,696.38 and 1,009.02

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Solution

The fourth proportional to 1,231.38, 1,696.38 and 1,009.02 is: 1,390.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.38 : 1,696.38 = 1,009.02 : x
  2. Step 2: Convert to fraction form
    1,231.38/1,696.38 = 1,009.02/x
  3. Step 3: Cross multiply
    1,231.38x = 1,696.38 × 1,009.02
  4. Step 4: Simplify right side
    1,231.38x = 1,711,681.35
  5. Step 5: Solve for x
    x = 1,711,681.35/1,231.38
  6. Step 6: Final answer
    x = 1,390.05

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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.