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Finding the Fourth Proportional to 691,686, 954,526.68 and 389,890.80

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Solution

The fourth proportional to 691,686, 954,526.68 and 389,890.80 is: 538,049.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,686 : 954,526.68 = 389,890.80 : x
  2. Step 2: Convert to fraction form
    691,686/954,526.68 = 389,890.80/x
  3. Step 3: Cross multiply
    691,686x = 954,526.68 × 389,890.80
  4. Step 4: Simplify right side
    691,686x = 372,161,170,886.54
  5. Step 5: Solve for x
    x = 372,161,170,886.54/691,686
  6. Step 6: Final answer
    x = 538,049.30

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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.