Home / 1,121.06-1,681.23-390.44

Finding the Fourth Proportional to 1,121.06, 1,681.23 and 390.44

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Solution

The fourth proportional to 1,121.06, 1,681.23 and 390.44 is: 585.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.06 : 1,681.23 = 390.44 : x
  2. Step 2: Convert to fraction form
    1,121.06/1,681.23 = 390.44/x
  3. Step 3: Cross multiply
    1,121.06x = 1,681.23 × 390.44
  4. Step 4: Simplify right side
    1,121.06x = 656,419.44
  5. Step 5: Solve for x
    x = 656,419.44/1,121.06
  6. Step 6: Final answer
    x = 585.53

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1.5x scale

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.