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Finding the Fourth Proportional to 1,620.84, 2,429.74 and 646.68

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Solution

The fourth proportional to 1,620.84, 2,429.74 and 646.68 is: 969.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.84 : 2,429.74 = 646.68 : x
  2. Step 2: Convert to fraction form
    1,620.84/2,429.74 = 646.68/x
  3. Step 3: Cross multiply
    1,620.84x = 2,429.74 × 646.68
  4. Step 4: Simplify right side
    1,620.84x = 1,571,264.26
  5. Step 5: Solve for x
    x = 1,571,264.26/1,620.84
  6. Step 6: Final answer
    x = 969.41

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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.