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Finding the Fourth Proportional to 3,690.65, 5,535.88 and 917.28

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Solution

The fourth proportional to 3,690.65, 5,535.88 and 917.28 is: 1,375.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,690.65 : 5,535.88 = 917.28 : x
  2. Step 2: Convert to fraction form
    3,690.65/5,535.88 = 917.28/x
  3. Step 3: Cross multiply
    3,690.65x = 5,535.88 × 917.28
  4. Step 4: Simplify right side
    3,690.65x = 5,077,949.71
  5. Step 5: Solve for x
    x = 5,077,949.71/3,690.65
  6. Step 6: Final answer
    x = 1,375.89

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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.