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Finding the Fourth Proportional to 1,081.20, 1,491.68 and 661.36

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Solution

The fourth proportional to 1,081.20, 1,491.68 and 661.36 is: 912.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.20 : 1,491.68 = 661.36 : x
  2. Step 2: Convert to fraction form
    1,081.20/1,491.68 = 661.36/x
  3. Step 3: Cross multiply
    1,081.20x = 1,491.68 × 661.36
  4. Step 4: Simplify right side
    1,081.20x = 986,537.48
  5. Step 5: Solve for x
    x = 986,537.48/1,081.20
  6. Step 6: Final answer
    x = 912.45

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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.