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Finding the Fourth Proportional to 1,917.40, 2,875.72 and 942.88

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Solution

The fourth proportional to 1,917.40, 2,875.72 and 942.88 is: 1,414.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.40 : 2,875.72 = 942.88 : x
  2. Step 2: Convert to fraction form
    1,917.40/2,875.72 = 942.88/x
  3. Step 3: Cross multiply
    1,917.40x = 2,875.72 × 942.88
  4. Step 4: Simplify right side
    1,917.40x = 2,711,458.87
  5. Step 5: Solve for x
    x = 2,711,458.87/1,917.40
  6. Step 6: Final answer
    x = 1,414.13

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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.