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Finding the Fourth Proportional to 989.74, 1,366.37 and 723.91

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Solution

The fourth proportional to 989.74, 1,366.37 and 723.91 is: 999.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.74 : 1,366.37 = 723.91 : x
  2. Step 2: Convert to fraction form
    989.74/1,366.37 = 723.91/x
  3. Step 3: Cross multiply
    989.74x = 1,366.37 × 723.91
  4. Step 4: Simplify right side
    989.74x = 989,128.91
  5. Step 5: Solve for x
    x = 989,128.91/989.74
  6. Step 6: Final answer
    x = 999.38

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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.