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Finding the Fourth Proportional to 1,216.60, 1,824.54 and 639.16

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Solution

The fourth proportional to 1,216.60, 1,824.54 and 639.16 is: 958.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.60 : 1,824.54 = 639.16 : x
  2. Step 2: Convert to fraction form
    1,216.60/1,824.54 = 639.16/x
  3. Step 3: Cross multiply
    1,216.60x = 1,824.54 × 639.16
  4. Step 4: Simplify right side
    1,216.60x = 1,166,172.99
  5. Step 5: Solve for x
    x = 1,166,172.99/1,216.60
  6. Step 6: Final answer
    x = 958.55

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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.