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Finding the Fourth Proportional to 1,135.74, 1,704.50 and 916.90

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Solution

The fourth proportional to 1,135.74, 1,704.50 and 916.90 is: 1,376.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.74 : 1,704.50 = 916.90 : x
  2. Step 2: Convert to fraction form
    1,135.74/1,704.50 = 916.90/x
  3. Step 3: Cross multiply
    1,135.74x = 1,704.50 × 916.90
  4. Step 4: Simplify right side
    1,135.74x = 1,562,856.05
  5. Step 5: Solve for x
    x = 1,562,856.05/1,135.74
  6. Step 6: Final answer
    x = 1,376.07

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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.