Home / 1,079.37-1,618.85-421.25

Finding the Fourth Proportional to 1,079.37, 1,618.85 and 421.25

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Solution

The fourth proportional to 1,079.37, 1,618.85 and 421.25 is: 631.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.37 : 1,618.85 = 421.25 : x
  2. Step 2: Convert to fraction form
    1,079.37/1,618.85 = 421.25/x
  3. Step 3: Cross multiply
    1,079.37x = 1,618.85 × 421.25
  4. Step 4: Simplify right side
    1,079.37x = 681,930.36
  5. Step 5: Solve for x
    x = 681,930.36/1,079.37
  6. Step 6: Final answer
    x = 631.79

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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.