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Finding the Fourth Proportional to 993.52, 1,490.32 and 416.40

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Solution

The fourth proportional to 993.52, 1,490.32 and 416.40 is: 624.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.52 : 1,490.32 = 416.40 : x
  2. Step 2: Convert to fraction form
    993.52/1,490.32 = 416.40/x
  3. Step 3: Cross multiply
    993.52x = 1,490.32 × 416.40
  4. Step 4: Simplify right side
    993.52x = 620,569.25
  5. Step 5: Solve for x
    x = 620,569.25/993.52
  6. Step 6: Final answer
    x = 624.62

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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.