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Finding the Fourth Proportional to 1,325.36, 1,988.40 and 400.88

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Solution

The fourth proportional to 1,325.36, 1,988.40 and 400.88 is: 601.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.36 : 1,988.40 = 400.88 : x
  2. Step 2: Convert to fraction form
    1,325.36/1,988.40 = 400.88/x
  3. Step 3: Cross multiply
    1,325.36x = 1,988.40 × 400.88
  4. Step 4: Simplify right side
    1,325.36x = 797,109.79
  5. Step 5: Solve for x
    x = 797,109.79/1,325.36
  6. Step 6: Final answer
    x = 601.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.