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Finding the Fourth Proportional to 990.00, 1,478.68 and 896.05

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Solution

The fourth proportional to 990.00, 1,478.68 and 896.05 is: 1,338.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.00 : 1,478.68 = 896.05 : x
  2. Step 2: Convert to fraction form
    990.00/1,478.68 = 896.05/x
  3. Step 3: Cross multiply
    990.00x = 1,478.68 × 896.05
  4. Step 4: Simplify right side
    990.00x = 1,324,971.61
  5. Step 5: Solve for x
    x = 1,324,971.61/990.00
  6. Step 6: Final answer
    x = 1,338.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.