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Finding the Fourth Proportional to 990.74, 1,484.84 and 746.58

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Solution

The fourth proportional to 990.74, 1,484.84 and 746.58 is: 1,118.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.74 : 1,484.84 = 746.58 : x
  2. Step 2: Convert to fraction form
    990.74/1,484.84 = 746.58/x
  3. Step 3: Cross multiply
    990.74x = 1,484.84 × 746.58
  4. Step 4: Simplify right side
    990.74x = 1,108,551.85
  5. Step 5: Solve for x
    x = 1,108,551.85/990.74
  6. Step 6: Final answer
    x = 1,118.91

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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.