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Finding the Fourth Proportional to 1,190.55, 1,643.76 and 742.59

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Solution

The fourth proportional to 1,190.55, 1,643.76 and 742.59 is: 1,025.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.55 : 1,643.76 = 742.59 : x
  2. Step 2: Convert to fraction form
    1,190.55/1,643.76 = 742.59/x
  3. Step 3: Cross multiply
    1,190.55x = 1,643.76 × 742.59
  4. Step 4: Simplify right side
    1,190.55x = 1,220,639.74
  5. Step 5: Solve for x
    x = 1,220,639.74/1,190.55
  6. Step 6: Final answer
    x = 1,025.27

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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.