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Finding the Fourth Proportional to 1,657.79, 2,287.71 and 911.75

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Solution

The fourth proportional to 1,657.79, 2,287.71 and 911.75 is: 1,258.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,657.79 : 2,287.71 = 911.75 : x
  2. Step 2: Convert to fraction form
    1,657.79/2,287.71 = 911.75/x
  3. Step 3: Cross multiply
    1,657.79x = 2,287.71 × 911.75
  4. Step 4: Simplify right side
    1,657.79x = 2,085,819.59
  5. Step 5: Solve for x
    x = 2,085,819.59/1,657.79
  6. Step 6: Final answer
    x = 1,258.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.