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Finding the Fourth Proportional to 2,428.58, 3,640.64 and 784.28

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Solution

The fourth proportional to 2,428.58, 3,640.64 and 784.28 is: 1,175.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,428.58 : 3,640.64 = 784.28 : x
  2. Step 2: Convert to fraction form
    2,428.58/3,640.64 = 784.28/x
  3. Step 3: Cross multiply
    2,428.58x = 3,640.64 × 784.28
  4. Step 4: Simplify right side
    2,428.58x = 2,855,259.01
  5. Step 5: Solve for x
    x = 2,855,259.01/2,428.58
  6. Step 6: Final answer
    x = 1,175.69

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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.