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Finding the Fourth Proportional to 945.65, 1,418.44 and 287.51

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Solution

The fourth proportional to 945.65, 1,418.44 and 287.51 is: 431.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.65 : 1,418.44 = 287.51 : x
  2. Step 2: Convert to fraction form
    945.65/1,418.44 = 287.51/x
  3. Step 3: Cross multiply
    945.65x = 1,418.44 × 287.51
  4. Step 4: Simplify right side
    945.65x = 407,807.15
  5. Step 5: Solve for x
    x = 407,807.15/945.65
  6. Step 6: Final answer
    x = 431.25

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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.