Home / 1,307.70-1,961.19-485.91

Finding the Fourth Proportional to 1,307.70, 1,961.19 and 485.91

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Solution

The fourth proportional to 1,307.70, 1,961.19 and 485.91 is: 728.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.70 : 1,961.19 = 485.91 : x
  2. Step 2: Convert to fraction form
    1,307.70/1,961.19 = 485.91/x
  3. Step 3: Cross multiply
    1,307.70x = 1,961.19 × 485.91
  4. Step 4: Simplify right side
    1,307.70x = 952,961.83
  5. Step 5: Solve for x
    x = 952,961.83/1,307.70
  6. Step 6: Final answer
    x = 728.73

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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.