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Finding the Fourth Proportional to 993.92, 1,490.24 and 561.28

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Solution

The fourth proportional to 993.92, 1,490.24 and 561.28 is: 841.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.92 : 1,490.24 = 561.28 : x
  2. Step 2: Convert to fraction form
    993.92/1,490.24 = 561.28/x
  3. Step 3: Cross multiply
    993.92x = 1,490.24 × 561.28
  4. Step 4: Simplify right side
    993.92x = 836,441.91
  5. Step 5: Solve for x
    x = 836,441.91/993.92
  6. Step 6: Final answer
    x = 841.56

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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.