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Finding the Fourth Proportional to 1,080.10, 1,490.70 and 785.26

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Solution

The fourth proportional to 1,080.10, 1,490.70 and 785.26 is: 1,083.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.10 : 1,490.70 = 785.26 : x
  2. Step 2: Convert to fraction form
    1,080.10/1,490.70 = 785.26/x
  3. Step 3: Cross multiply
    1,080.10x = 1,490.70 × 785.26
  4. Step 4: Simplify right side
    1,080.10x = 1,170,587.08
  5. Step 5: Solve for x
    x = 1,170,587.08/1,080.10
  6. Step 6: Final answer
    x = 1,083.78

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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.