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Finding the Fourth Proportional to 1,325.74, 1,988.65 and 401.30

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Solution

The fourth proportional to 1,325.74, 1,988.65 and 401.30 is: 601.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.74 : 1,988.65 = 401.30 : x
  2. Step 2: Convert to fraction form
    1,325.74/1,988.65 = 401.30/x
  3. Step 3: Cross multiply
    1,325.74x = 1,988.65 × 401.30
  4. Step 4: Simplify right side
    1,325.74x = 798,045.25
  5. Step 5: Solve for x
    x = 798,045.25/1,325.74
  6. Step 6: Final answer
    x = 601.96

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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.