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Finding the Fourth Proportional to 1,568.18, 2,351.64 and 643.70

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Solution

The fourth proportional to 1,568.18, 2,351.64 and 643.70 is: 965.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,568.18 : 2,351.64 = 643.70 : x
  2. Step 2: Convert to fraction form
    1,568.18/2,351.64 = 643.70/x
  3. Step 3: Cross multiply
    1,568.18x = 2,351.64 × 643.70
  4. Step 4: Simplify right side
    1,568.18x = 1,513,750.67
  5. Step 5: Solve for x
    x = 1,513,750.67/1,568.18
  6. Step 6: Final answer
    x = 965.29

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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.