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Finding the Fourth Proportional to 9,891.63, 13,649.43 and 5,643.36

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Solution

The fourth proportional to 9,891.63, 13,649.43 and 5,643.36 is: 7,787.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,891.63 : 13,649.43 = 5,643.36 : x
  2. Step 2: Convert to fraction form
    9,891.63/13,649.43 = 5,643.36/x
  3. Step 3: Cross multiply
    9,891.63x = 13,649.43 × 5,643.36
  4. Step 4: Simplify right side
    9,891.63x = 77,028,647.28
  5. Step 5: Solve for x
    x = 77,028,647.28/9,891.63
  6. Step 6: Final answer
    x = 7,787.26

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1.5x scale

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.