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Finding the Fourth Proportional to 993.80, 1,490.61 and 335.66

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Solution

The fourth proportional to 993.80, 1,490.61 and 335.66 is: 503.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.80 : 1,490.61 = 335.66 : x
  2. Step 2: Convert to fraction form
    993.80/1,490.61 = 335.66/x
  3. Step 3: Cross multiply
    993.80x = 1,490.61 × 335.66
  4. Step 4: Simplify right side
    993.80x = 500,338.15
  5. Step 5: Solve for x
    x = 500,338.15/993.80
  6. Step 6: Final answer
    x = 503.46

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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.