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Finding the Fourth Proportional to 990.10, 1,484.08 and 556.34

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Solution

The fourth proportional to 990.10, 1,484.08 and 556.34 is: 833.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.10 : 1,484.08 = 556.34 : x
  2. Step 2: Convert to fraction form
    990.10/1,484.08 = 556.34/x
  3. Step 3: Cross multiply
    990.10x = 1,484.08 × 556.34
  4. Step 4: Simplify right side
    990.10x = 825,653.07
  5. Step 5: Solve for x
    x = 825,653.07/990.10
  6. Step 6: Final answer
    x = 833.91

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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.