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Finding the Fourth Proportional to 259,427.80, 388,680.90 and 212,426.20

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Solution

The fourth proportional to 259,427.80, 388,680.90 and 212,426.20 is: 318,261.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,427.80 : 388,680.90 = 212,426.20 : x
  2. Step 2: Convert to fraction form
    259,427.80/388,680.90 = 212,426.20/x
  3. Step 3: Cross multiply
    259,427.80x = 388,680.90 × 212,426.20
  4. Step 4: Simplify right side
    259,427.80x = 82,566,006,599.58
  5. Step 5: Solve for x
    x = 82,566,006,599.58/259,427.80
  6. Step 6: Final answer
    x = 318,261.99

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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.