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Finding the Fourth Proportional to 989.24, 1,366.13 and 640.13

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Solution

The fourth proportional to 989.24, 1,366.13 and 640.13 is: 884.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.24 : 1,366.13 = 640.13 : x
  2. Step 2: Convert to fraction form
    989.24/1,366.13 = 640.13/x
  3. Step 3: Cross multiply
    989.24x = 1,366.13 × 640.13
  4. Step 4: Simplify right side
    989.24x = 874,495.57
  5. Step 5: Solve for x
    x = 874,495.57/989.24
  6. Step 6: Final answer
    x = 884.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.