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Finding the Fourth Proportional to 1,122.98, 1,676.90 and 917.96

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Solution

The fourth proportional to 1,122.98, 1,676.90 and 917.96 is: 1,370.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.98 : 1,676.90 = 917.96 : x
  2. Step 2: Convert to fraction form
    1,122.98/1,676.90 = 917.96/x
  3. Step 3: Cross multiply
    1,122.98x = 1,676.90 × 917.96
  4. Step 4: Simplify right side
    1,122.98x = 1,539,327.12
  5. Step 5: Solve for x
    x = 1,539,327.12/1,122.98
  6. Step 6: Final answer
    x = 1,370.75

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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.