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Finding the Fourth Proportional to 98,578.88, 135,988.32 and 66,736.64

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Solution

The fourth proportional to 98,578.88, 135,988.32 and 66,736.64 is: 92,062.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,578.88 : 135,988.32 = 66,736.64 : x
  2. Step 2: Convert to fraction form
    98,578.88/135,988.32 = 66,736.64/x
  3. Step 3: Cross multiply
    98,578.88x = 135,988.32 × 66,736.64
  4. Step 4: Simplify right side
    98,578.88x = 9,075,403,556.04
  5. Step 5: Solve for x
    x = 9,075,403,556.04/98,578.88
  6. Step 6: Final answer
    x = 92,062.35

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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.