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Finding the Fourth Proportional to 611.65, 917.43 and 303.45

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Solution

The fourth proportional to 611.65, 917.43 and 303.45 is: 455.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.65 : 917.43 = 303.45 : x
  2. Step 2: Convert to fraction form
    611.65/917.43 = 303.45/x
  3. Step 3: Cross multiply
    611.65x = 917.43 × 303.45
  4. Step 4: Simplify right side
    611.65x = 278,389.56
  5. Step 5: Solve for x
    x = 278,389.56/611.65
  6. Step 6: Final answer
    x = 455.14

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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.