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Finding the Fourth Proportional to 1,325.52, 1,988.19 and 401.12

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Solution

The fourth proportional to 1,325.52, 1,988.19 and 401.12 is: 601.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.52 : 1,988.19 = 401.12 : x
  2. Step 2: Convert to fraction form
    1,325.52/1,988.19 = 401.12/x
  3. Step 3: Cross multiply
    1,325.52x = 1,988.19 × 401.12
  4. Step 4: Simplify right side
    1,325.52x = 797,492.83
  5. Step 5: Solve for x
    x = 797,492.83/1,325.52
  6. Step 6: Final answer
    x = 601.65

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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.