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Finding the Fourth Proportional to 1,485.05, 2,231.05 and 869.20

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Solution

The fourth proportional to 1,485.05, 2,231.05 and 869.20 is: 1,305.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.05 : 2,231.05 = 869.20 : x
  2. Step 2: Convert to fraction form
    1,485.05/2,231.05 = 869.20/x
  3. Step 3: Cross multiply
    1,485.05x = 2,231.05 × 869.20
  4. Step 4: Simplify right side
    1,485.05x = 1,939,220.91
  5. Step 5: Solve for x
    x = 1,939,220.91/1,485.05
  6. Step 6: Final answer
    x = 1,305.83

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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.