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Finding the Fourth Proportional to 1,190.68, 1,643.28 and 910.42

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Solution

The fourth proportional to 1,190.68, 1,643.28 and 910.42 is: 1,256.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.68 : 1,643.28 = 910.42 : x
  2. Step 2: Convert to fraction form
    1,190.68/1,643.28 = 910.42/x
  3. Step 3: Cross multiply
    1,190.68x = 1,643.28 × 910.42
  4. Step 4: Simplify right side
    1,190.68x = 1,496,074.98
  5. Step 5: Solve for x
    x = 1,496,074.98/1,190.68
  6. Step 6: Final answer
    x = 1,256.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.