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Finding the Fourth Proportional to 1,080.74, 1,491.04 and 707.93

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Solution

The fourth proportional to 1,080.74, 1,491.04 and 707.93 is: 976.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.74 : 1,491.04 = 707.93 : x
  2. Step 2: Convert to fraction form
    1,080.74/1,491.04 = 707.93/x
  3. Step 3: Cross multiply
    1,080.74x = 1,491.04 × 707.93
  4. Step 4: Simplify right side
    1,080.74x = 1,055,551.95
  5. Step 5: Solve for x
    x = 1,055,551.95/1,080.74
  6. Step 6: Final answer
    x = 976.69

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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.