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Finding the Fourth Proportional to 1,325.86, 1,989.10 and 401.36

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Solution

The fourth proportional to 1,325.86, 1,989.10 and 401.36 is: 602.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.86 : 1,989.10 = 401.36 : x
  2. Step 2: Convert to fraction form
    1,325.86/1,989.10 = 401.36/x
  3. Step 3: Cross multiply
    1,325.86x = 1,989.10 × 401.36
  4. Step 4: Simplify right side
    1,325.86x = 798,345.18
  5. Step 5: Solve for x
    x = 798,345.18/1,325.86
  6. Step 6: Final answer
    x = 602.13

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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.