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Finding the Fourth Proportional to 660,245.92, 911,143.10 and 388,325.28

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Solution

The fourth proportional to 660,245.92, 911,143.10 and 388,325.28 is: 535,891.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,245.92 : 911,143.10 = 388,325.28 : x
  2. Step 2: Convert to fraction form
    660,245.92/911,143.10 = 388,325.28/x
  3. Step 3: Cross multiply
    660,245.92x = 911,143.10 × 388,325.28
  4. Step 4: Simplify right side
    660,245.92x = 353,819,899,427.57
  5. Step 5: Solve for x
    x = 353,819,899,427.57/660,245.92
  6. Step 6: Final answer
    x = 535,891.08

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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.