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Finding the Fourth Proportional to 1,325.33, 1,988.02 and 400.90

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Solution

The fourth proportional to 1,325.33, 1,988.02 and 400.90 is: 601.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.33 : 1,988.02 = 400.90 : x
  2. Step 2: Convert to fraction form
    1,325.33/1,988.02 = 400.90/x
  3. Step 3: Cross multiply
    1,325.33x = 1,988.02 × 400.90
  4. Step 4: Simplify right side
    1,325.33x = 796,985.27
  5. Step 5: Solve for x
    x = 796,985.27/1,325.33
  6. Step 6: Final answer
    x = 601.35

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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.