Home / 1,405.16-2,104.80-1,129.76

Finding the Fourth Proportional to 1,405.16, 2,104.80 and 1,129.76

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Solution

The fourth proportional to 1,405.16, 2,104.80 and 1,129.76 is: 1,692.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.16 : 2,104.80 = 1,129.76 : x
  2. Step 2: Convert to fraction form
    1,405.16/2,104.80 = 1,129.76/x
  3. Step 3: Cross multiply
    1,405.16x = 2,104.80 × 1,129.76
  4. Step 4: Simplify right side
    1,405.16x = 2,377,918.85
  5. Step 5: Solve for x
    x = 2,377,918.85/1,405.16
  6. Step 6: Final answer
    x = 1,692.28

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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.