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Finding the Fourth Proportional to 333.65, 500.31 and 128.18

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Solution

The fourth proportional to 333.65, 500.31 and 128.18 is: 192.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    333.65 : 500.31 = 128.18 : x
  2. Step 2: Convert to fraction form
    333.65/500.31 = 128.18/x
  3. Step 3: Cross multiply
    333.65x = 500.31 × 128.18
  4. Step 4: Simplify right side
    333.65x = 64,130.99
  5. Step 5: Solve for x
    x = 64,130.99/333.65
  6. Step 6: Final answer
    x = 192.21

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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.