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Finding the Fourth Proportional to 660,242.92, 911,138.96 and 388,322.28

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Solution

The fourth proportional to 660,242.92, 911,138.96 and 388,322.28 is: 535,886.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,242.92 : 911,138.96 = 388,322.28 : x
  2. Step 2: Convert to fraction form
    660,242.92/911,138.96 = 388,322.28/x
  3. Step 3: Cross multiply
    660,242.92x = 911,138.96 × 388,322.28
  4. Step 4: Simplify right side
    660,242.92x = 353,815,558,344.03
  5. Step 5: Solve for x
    x = 353,815,558,344.03/660,242.92
  6. Step 6: Final answer
    x = 535,886.94

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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.