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Finding the Fourth Proportional to 1,640.48, 2,461.36 and 775.52

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Solution

The fourth proportional to 1,640.48, 2,461.36 and 775.52 is: 1,163.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.48 : 2,461.36 = 775.52 : x
  2. Step 2: Convert to fraction form
    1,640.48/2,461.36 = 775.52/x
  3. Step 3: Cross multiply
    1,640.48x = 2,461.36 × 775.52
  4. Step 4: Simplify right side
    1,640.48x = 1,908,833.91
  5. Step 5: Solve for x
    x = 1,908,833.91/1,640.48
  6. Step 6: Final answer
    x = 1,163.58

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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.