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Finding the Fourth Proportional to 993.21, 1,488.20 and 505.59

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Solution

The fourth proportional to 993.21, 1,488.20 and 505.59 is: 757.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.21 : 1,488.20 = 505.59 : x
  2. Step 2: Convert to fraction form
    993.21/1,488.20 = 505.59/x
  3. Step 3: Cross multiply
    993.21x = 1,488.20 × 505.59
  4. Step 4: Simplify right side
    993.21x = 752,424.93
  5. Step 5: Solve for x
    x = 752,424.93/993.21
  6. Step 6: Final answer
    x = 757.57

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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.