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Finding the Fourth Proportional to 1,019.43, 1,520.53 and 988.68

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Solution

The fourth proportional to 1,019.43, 1,520.53 and 988.68 is: 1,474.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.43 : 1,520.53 = 988.68 : x
  2. Step 2: Convert to fraction form
    1,019.43/1,520.53 = 988.68/x
  3. Step 3: Cross multiply
    1,019.43x = 1,520.53 × 988.68
  4. Step 4: Simplify right side
    1,019.43x = 1,503,317.60
  5. Step 5: Solve for x
    x = 1,503,317.60/1,019.43
  6. Step 6: Final answer
    x = 1,474.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.