Home / 1,921.13-2,881.40-688.58

Finding the Fourth Proportional to 1,921.13, 2,881.40 and 688.58

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Solution

The fourth proportional to 1,921.13, 2,881.40 and 688.58 is: 1,032.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.13 : 2,881.40 = 688.58 : x
  2. Step 2: Convert to fraction form
    1,921.13/2,881.40 = 688.58/x
  3. Step 3: Cross multiply
    1,921.13x = 2,881.40 × 688.58
  4. Step 4: Simplify right side
    1,921.13x = 1,984,056.56
  5. Step 5: Solve for x
    x = 1,984,056.56/1,921.13
  6. Step 6: Final answer
    x = 1,032.76

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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.