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Finding the Fourth Proportional to 1,924.39, 2,886.81 and 691.70

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Solution

The fourth proportional to 1,924.39, 2,886.81 and 691.70 is: 1,037.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,924.39 : 2,886.81 = 691.70 : x
  2. Step 2: Convert to fraction form
    1,924.39/2,886.81 = 691.70/x
  3. Step 3: Cross multiply
    1,924.39x = 2,886.81 × 691.70
  4. Step 4: Simplify right side
    1,924.39x = 1,996,792.04
  5. Step 5: Solve for x
    x = 1,996,792.04/1,924.39
  6. Step 6: Final answer
    x = 1,037.62

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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.