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Finding the Fourth Proportional to 1,966.47, 2,949.78 and 579.81

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Solution

The fourth proportional to 1,966.47, 2,949.78 and 579.81 is: 869.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,966.47 : 2,949.78 = 579.81 : x
  2. Step 2: Convert to fraction form
    1,966.47/2,949.78 = 579.81/x
  3. Step 3: Cross multiply
    1,966.47x = 2,949.78 × 579.81
  4. Step 4: Simplify right side
    1,966.47x = 1,710,311.94
  5. Step 5: Solve for x
    x = 1,710,311.94/1,966.47
  6. Step 6: Final answer
    x = 869.74

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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.