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Finding the Fourth Proportional to 660,716.16, 911,968.38 and 388,871.25

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Solution

The fourth proportional to 660,716.16, 911,968.38 and 388,871.25 is: 536,748.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,716.16 : 911,968.38 = 388,871.25 : x
  2. Step 2: Convert to fraction form
    660,716.16/911,968.38 = 388,871.25/x
  3. Step 3: Cross multiply
    660,716.16x = 911,968.38 × 388,871.25
  4. Step 4: Simplify right side
    660,716.16x = 354,638,283,891.08
  5. Step 5: Solve for x
    x = 354,638,283,891.08/660,716.16
  6. Step 6: Final answer
    x = 536,748.31

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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.