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Finding the Fourth Proportional to 1,185.10, 1,635.36 and 661.12

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Solution

The fourth proportional to 1,185.10, 1,635.36 and 661.12 is: 912.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.10 : 1,635.36 = 661.12 : x
  2. Step 2: Convert to fraction form
    1,185.10/1,635.36 = 661.12/x
  3. Step 3: Cross multiply
    1,185.10x = 1,635.36 × 661.12
  4. Step 4: Simplify right side
    1,185.10x = 1,081,169.20
  5. Step 5: Solve for x
    x = 1,081,169.20/1,185.10
  6. Step 6: Final answer
    x = 912.30

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1.5x scale

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.