Home / 1,188.18-1,643.63-991.35

Finding the Fourth Proportional to 1,188.18, 1,643.63 and 991.35

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Solution

The fourth proportional to 1,188.18, 1,643.63 and 991.35 is: 1,371.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.18 : 1,643.63 = 991.35 : x
  2. Step 2: Convert to fraction form
    1,188.18/1,643.63 = 991.35/x
  3. Step 3: Cross multiply
    1,188.18x = 1,643.63 × 991.35
  4. Step 4: Simplify right side
    1,188.18x = 1,629,407.64
  5. Step 5: Solve for x
    x = 1,629,407.64/1,188.18
  6. Step 6: Final answer
    x = 1,371.35

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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.