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Finding the Fourth Proportional to 1,386.72, 2,080.05 and 656.82

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Solution

The fourth proportional to 1,386.72, 2,080.05 and 656.82 is: 985.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.72 : 2,080.05 = 656.82 : x
  2. Step 2: Convert to fraction form
    1,386.72/2,080.05 = 656.82/x
  3. Step 3: Cross multiply
    1,386.72x = 2,080.05 × 656.82
  4. Step 4: Simplify right side
    1,386.72x = 1,366,218.44
  5. Step 5: Solve for x
    x = 1,366,218.44/1,386.72
  6. Step 6: Final answer
    x = 985.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.