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Finding the Fourth Proportional to 1,190.90, 1,642.68 and 858.80

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Solution

The fourth proportional to 1,190.90, 1,642.68 and 858.80 is: 1,184.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.90 : 1,642.68 = 858.80 : x
  2. Step 2: Convert to fraction form
    1,190.90/1,642.68 = 858.80/x
  3. Step 3: Cross multiply
    1,190.90x = 1,642.68 × 858.80
  4. Step 4: Simplify right side
    1,190.90x = 1,410,737.69
  5. Step 5: Solve for x
    x = 1,410,737.69/1,190.90
  6. Step 6: Final answer
    x = 1,184.60

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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.