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Finding the Fourth Proportional to 2,428.79, 3,643.21 and 785.35

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Solution

The fourth proportional to 2,428.79, 3,643.21 and 785.35 is: 1,178.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,428.79 : 3,643.21 = 785.35 : x
  2. Step 2: Convert to fraction form
    2,428.79/3,643.21 = 785.35/x
  3. Step 3: Cross multiply
    2,428.79x = 3,643.21 × 785.35
  4. Step 4: Simplify right side
    2,428.79x = 2,861,194.97
  5. Step 5: Solve for x
    x = 2,861,194.97/2,428.79
  6. Step 6: Final answer
    x = 1,178.03

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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.