Home / 1,221.30-1,832.55-928.70

Finding the Fourth Proportional to 1,221.30, 1,832.55 and 928.70

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Solution

The fourth proportional to 1,221.30, 1,832.55 and 928.70 is: 1,393.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.30 : 1,832.55 = 928.70 : x
  2. Step 2: Convert to fraction form
    1,221.30/1,832.55 = 928.70/x
  3. Step 3: Cross multiply
    1,221.30x = 1,832.55 × 928.70
  4. Step 4: Simplify right side
    1,221.30x = 1,701,889.19
  5. Step 5: Solve for x
    x = 1,701,889.19/1,221.30
  6. Step 6: Final answer
    x = 1,393.51

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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.