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Finding the Fourth Proportional to 1,080.74, 1,491.36 and 608.64

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Solution

The fourth proportional to 1,080.74, 1,491.36 and 608.64 is: 839.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.74 : 1,491.36 = 608.64 : x
  2. Step 2: Convert to fraction form
    1,080.74/1,491.36 = 608.64/x
  3. Step 3: Cross multiply
    1,080.74x = 1,491.36 × 608.64
  4. Step 4: Simplify right side
    1,080.74x = 907,701.35
  5. Step 5: Solve for x
    x = 907,701.35/1,080.74
  6. Step 6: Final answer
    x = 839.89

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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.