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Finding the Fourth Proportional to 1,307.58, 1,790.90 and 1,231.85

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Solution

The fourth proportional to 1,307.58, 1,790.90 and 1,231.85 is: 1,687.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.58 : 1,790.90 = 1,231.85 : x
  2. Step 2: Convert to fraction form
    1,307.58/1,790.90 = 1,231.85/x
  3. Step 3: Cross multiply
    1,307.58x = 1,790.90 × 1,231.85
  4. Step 4: Simplify right side
    1,307.58x = 2,206,105.05
  5. Step 5: Solve for x
    x = 2,206,105.05/1,307.58
  6. Step 6: Final answer
    x = 1,687.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.