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Finding the Fourth Proportional to 1,918.16, 2,877.68 and 685.64

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Solution

The fourth proportional to 1,918.16, 2,877.68 and 685.64 is: 1,028.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.16 : 2,877.68 = 685.64 : x
  2. Step 2: Convert to fraction form
    1,918.16/2,877.68 = 685.64/x
  3. Step 3: Cross multiply
    1,918.16x = 2,877.68 × 685.64
  4. Step 4: Simplify right side
    1,918.16x = 1,973,052.52
  5. Step 5: Solve for x
    x = 1,973,052.52/1,918.16
  6. Step 6: Final answer
    x = 1,028.62

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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.