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Finding the Fourth Proportional to 918.75, 1,378.31 and 302.51

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Solution

The fourth proportional to 918.75, 1,378.31 and 302.51 is: 453.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.75 : 1,378.31 = 302.51 : x
  2. Step 2: Convert to fraction form
    918.75/1,378.31 = 302.51/x
  3. Step 3: Cross multiply
    918.75x = 1,378.31 × 302.51
  4. Step 4: Simplify right side
    918.75x = 416,944.15
  5. Step 5: Solve for x
    x = 416,944.15/918.75
  6. Step 6: Final answer
    x = 453.82

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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.