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Finding the Fourth Proportional to 2,088, 3,131.28 and 917.64

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Solution

The fourth proportional to 2,088, 3,131.28 and 917.64 is: 1,376.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,088 : 3,131.28 = 917.64 : x
  2. Step 2: Convert to fraction form
    2,088/3,131.28 = 917.64/x
  3. Step 3: Cross multiply
    2,088x = 3,131.28 × 917.64
  4. Step 4: Simplify right side
    2,088x = 2,873,387.78
  5. Step 5: Solve for x
    x = 2,873,387.78/2,088
  6. Step 6: Final answer
    x = 1,376.14

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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.