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Finding the Fourth Proportional to 217,817.40, 326,726.10 and 211,985.40

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Solution

The fourth proportional to 217,817.40, 326,726.10 and 211,985.40 is: 317,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,817.40 : 326,726.10 = 211,985.40 : x
  2. Step 2: Convert to fraction form
    217,817.40/326,726.10 = 211,985.40/x
  3. Step 3: Cross multiply
    217,817.40x = 326,726.10 × 211,985.40
  4. Step 4: Simplify right side
    217,817.40x = 69,261,162,998.94
  5. Step 5: Solve for x
    x = 69,261,162,998.94/217,817.40
  6. Step 6: Final answer
    x = 317,978.10

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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.