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Finding the Fourth Proportional to 1,098.71, 1,641.27 and 988.85

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Solution

The fourth proportional to 1,098.71, 1,641.27 and 988.85 is: 1,477.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.71 : 1,641.27 = 988.85 : x
  2. Step 2: Convert to fraction form
    1,098.71/1,641.27 = 988.85/x
  3. Step 3: Cross multiply
    1,098.71x = 1,641.27 × 988.85
  4. Step 4: Simplify right side
    1,098.71x = 1,622,961.63
  5. Step 5: Solve for x
    x = 1,622,961.63/1,098.71
  6. Step 6: Final answer
    x = 1,477.16

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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.