Home / 1,155.15-1,595.30-890.55

Finding the Fourth Proportional to 1,155.15, 1,595.30 and 890.55

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Solution

The fourth proportional to 1,155.15, 1,595.30 and 890.55 is: 1,229.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,155.15 : 1,595.30 = 890.55 : x
  2. Step 2: Convert to fraction form
    1,155.15/1,595.30 = 890.55/x
  3. Step 3: Cross multiply
    1,155.15x = 1,595.30 × 890.55
  4. Step 4: Simplify right side
    1,155.15x = 1,420,689.96
  5. Step 5: Solve for x
    x = 1,420,689.96/1,155.15
  6. Step 6: Final answer
    x = 1,229.87

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Why These Related Problems?

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