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Finding the Fourth Proportional to 1,068.78, 1,602.09 and 990.21

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Solution

The fourth proportional to 1,068.78, 1,602.09 and 990.21 is: 1,484.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.78 : 1,602.09 = 990.21 : x
  2. Step 2: Convert to fraction form
    1,068.78/1,602.09 = 990.21/x
  3. Step 3: Cross multiply
    1,068.78x = 1,602.09 × 990.21
  4. Step 4: Simplify right side
    1,068.78x = 1,586,405.54
  5. Step 5: Solve for x
    x = 1,586,405.54/1,068.78
  6. Step 6: Final answer
    x = 1,484.31

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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.