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Finding the Fourth Proportional to 993.88, 1,490.08 and 603.96

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Solution

The fourth proportional to 993.88, 1,490.08 and 603.96 is: 905.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.88 : 1,490.08 = 603.96 : x
  2. Step 2: Convert to fraction form
    993.88/1,490.08 = 603.96/x
  3. Step 3: Cross multiply
    993.88x = 1,490.08 × 603.96
  4. Step 4: Simplify right side
    993.88x = 899,948.72
  5. Step 5: Solve for x
    x = 899,948.72/993.88
  6. Step 6: Final answer
    x = 905.49

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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.