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Finding the Fourth Proportional to 1,087.74, 1,501.20 and 645.75

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Solution

The fourth proportional to 1,087.74, 1,501.20 and 645.75 is: 891.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.74 : 1,501.20 = 645.75 : x
  2. Step 2: Convert to fraction form
    1,087.74/1,501.20 = 645.75/x
  3. Step 3: Cross multiply
    1,087.74x = 1,501.20 × 645.75
  4. Step 4: Simplify right side
    1,087.74x = 969,399.90
  5. Step 5: Solve for x
    x = 969,399.90/1,087.74
  6. Step 6: Final answer
    x = 891.21

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