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Finding the Fourth Proportional to 259,616.81, 389,439.80 and 72,642.89

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Solution

The fourth proportional to 259,616.81, 389,439.80 and 72,642.89 is: 108,968.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,616.81 : 389,439.80 = 72,642.89 : x
  2. Step 2: Convert to fraction form
    259,616.81/389,439.80 = 72,642.89/x
  3. Step 3: Cross multiply
    259,616.81x = 389,439.80 × 72,642.89
  4. Step 4: Simplify right side
    259,616.81x = 28,290,033,435.82
  5. Step 5: Solve for x
    x = 28,290,033,435.82/259,616.81
  6. Step 6: Final answer
    x = 108,968.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.