Home / 1,555.15-2,330.70-1,121.80

Finding the Fourth Proportional to 1,555.15, 2,330.70 and 1,121.80

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Solution

The fourth proportional to 1,555.15, 2,330.70 and 1,121.80 is: 1,681.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.15 : 2,330.70 = 1,121.80 : x
  2. Step 2: Convert to fraction form
    1,555.15/2,330.70 = 1,121.80/x
  3. Step 3: Cross multiply
    1,555.15x = 2,330.70 × 1,121.80
  4. Step 4: Simplify right side
    1,555.15x = 2,614,579.26
  5. Step 5: Solve for x
    x = 2,614,579.26/1,555.15
  6. Step 6: Final answer
    x = 1,681.24

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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.