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Finding the Fourth Proportional to 1,325.23, 1,988.42 and 503.75

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Solution

The fourth proportional to 1,325.23, 1,988.42 and 503.75 is: 755.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.23 : 1,988.42 = 503.75 : x
  2. Step 2: Convert to fraction form
    1,325.23/1,988.42 = 503.75/x
  3. Step 3: Cross multiply
    1,325.23x = 1,988.42 × 503.75
  4. Step 4: Simplify right side
    1,325.23x = 1,001,669.03
  5. Step 5: Solve for x
    x = 1,001,669.03/1,325.23
  6. Step 6: Final answer
    x = 755.85

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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.