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Finding the Fourth Proportional to 217,816.40, 326,465.40 and 91,456.40

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Solution

The fourth proportional to 217,816.40, 326,465.40 and 91,456.40 is: 137,075.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,816.40 : 326,465.40 = 91,456.40 : x
  2. Step 2: Convert to fraction form
    217,816.40/326,465.40 = 91,456.40/x
  3. Step 3: Cross multiply
    217,816.40x = 326,465.40 × 91,456.40
  4. Step 4: Simplify right side
    217,816.40x = 29,857,350,208.56
  5. Step 5: Solve for x
    x = 29,857,350,208.56/217,816.40
  6. Step 6: Final answer
    x = 137,075.77

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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.