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Finding the Fourth Proportional to 918.69, 1,378.06 and 302.28

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Solution

The fourth proportional to 918.69, 1,378.06 and 302.28 is: 453.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.69 : 1,378.06 = 302.28 : x
  2. Step 2: Convert to fraction form
    918.69/1,378.06 = 302.28/x
  3. Step 3: Cross multiply
    918.69x = 1,378.06 × 302.28
  4. Step 4: Simplify right side
    918.69x = 416,563.51
  5. Step 5: Solve for x
    x = 416,563.51/918.69
  6. Step 6: Final answer
    x = 453.43

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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.