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Finding the Fourth Proportional to 1,705.58, 2,557.69 and 731

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Solution

The fourth proportional to 1,705.58, 2,557.69 and 731 is: 1,096.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,705.58 : 2,557.69 = 731 : x
  2. Step 2: Convert to fraction form
    1,705.58/2,557.69 = 731/x
  3. Step 3: Cross multiply
    1,705.58x = 2,557.69 × 731
  4. Step 4: Simplify right side
    1,705.58x = 1,869,671.39
  5. Step 5: Solve for x
    x = 1,869,671.39/1,705.58
  6. Step 6: Final answer
    x = 1,096.21

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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.