Home / 1,121.08-1,681.67-427.52

Finding the Fourth Proportional to 1,121.08, 1,681.67 and 427.52

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Solution

The fourth proportional to 1,121.08, 1,681.67 and 427.52 is: 641.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.08 : 1,681.67 = 427.52 : x
  2. Step 2: Convert to fraction form
    1,121.08/1,681.67 = 427.52/x
  3. Step 3: Cross multiply
    1,121.08x = 1,681.67 × 427.52
  4. Step 4: Simplify right side
    1,121.08x = 718,947.56
  5. Step 5: Solve for x
    x = 718,947.56/1,121.08
  6. Step 6: Final answer
    x = 641.30

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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.