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Finding the Fourth Proportional to 993.64, 1,490.46 and 585.63

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Solution

The fourth proportional to 993.64, 1,490.46 and 585.63 is: 878.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.64 : 1,490.46 = 585.63 : x
  2. Step 2: Convert to fraction form
    993.64/1,490.46 = 585.63/x
  3. Step 3: Cross multiply
    993.64x = 1,490.46 × 585.63
  4. Step 4: Simplify right side
    993.64x = 872,858.09
  5. Step 5: Solve for x
    x = 872,858.09/993.64
  6. Step 6: Final answer
    x = 878.45

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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.