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Finding the Fourth Proportional to 1,355.72, 2,030.73 and 861.87

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Solution

The fourth proportional to 1,355.72, 2,030.73 and 861.87 is: 1,291.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.72 : 2,030.73 = 861.87 : x
  2. Step 2: Convert to fraction form
    1,355.72/2,030.73 = 861.87/x
  3. Step 3: Cross multiply
    1,355.72x = 2,030.73 × 861.87
  4. Step 4: Simplify right side
    1,355.72x = 1,750,229.65
  5. Step 5: Solve for x
    x = 1,750,229.65/1,355.72
  6. Step 6: Final answer
    x = 1,291.00

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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.