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Finding the Fourth Proportional to 1,325.40, 1,988.03 and 545.21

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Solution

The fourth proportional to 1,325.40, 1,988.03 and 545.21 is: 817.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.40 : 1,988.03 = 545.21 : x
  2. Step 2: Convert to fraction form
    1,325.40/1,988.03 = 545.21/x
  3. Step 3: Cross multiply
    1,325.40x = 1,988.03 × 545.21
  4. Step 4: Simplify right side
    1,325.40x = 1,083,900.17
  5. Step 5: Solve for x
    x = 1,083,900.17/1,325.40
  6. Step 6: Final answer
    x = 817.79

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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.