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Finding the Fourth Proportional to 1,568.08, 2,350.56 and 643.90

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Solution

The fourth proportional to 1,568.08, 2,350.56 and 643.90 is: 965.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,568.08 : 2,350.56 = 643.90 : x
  2. Step 2: Convert to fraction form
    1,568.08/2,350.56 = 643.90/x
  3. Step 3: Cross multiply
    1,568.08x = 2,350.56 × 643.90
  4. Step 4: Simplify right side
    1,568.08x = 1,513,525.58
  5. Step 5: Solve for x
    x = 1,513,525.58/1,568.08
  6. Step 6: Final answer
    x = 965.21

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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.