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Finding the Fourth Proportional to 2,457.05, 3,685.69 and 813.74

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Solution

The fourth proportional to 2,457.05, 3,685.69 and 813.74 is: 1,220.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,457.05 : 3,685.69 = 813.74 : x
  2. Step 2: Convert to fraction form
    2,457.05/3,685.69 = 813.74/x
  3. Step 3: Cross multiply
    2,457.05x = 3,685.69 × 813.74
  4. Step 4: Simplify right side
    2,457.05x = 2,999,193.38
  5. Step 5: Solve for x
    x = 2,999,193.38/2,457.05
  6. Step 6: Final answer
    x = 1,220.65

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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.