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Finding the Fourth Proportional to 1,080.36, 1,490.90 and 707.11

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Solution

The fourth proportional to 1,080.36, 1,490.90 and 707.11 is: 975.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.36 : 1,490.90 = 707.11 : x
  2. Step 2: Convert to fraction form
    1,080.36/1,490.90 = 707.11/x
  3. Step 3: Cross multiply
    1,080.36x = 1,490.90 × 707.11
  4. Step 4: Simplify right side
    1,080.36x = 1,054,230.30
  5. Step 5: Solve for x
    x = 1,054,230.30/1,080.36
  6. Step 6: Final answer
    x = 975.81

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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.