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Finding the Fourth Proportional to 945.22, 1,418.32 and 425.12

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Solution

The fourth proportional to 945.22, 1,418.32 and 425.12 is: 637.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.22 : 1,418.32 = 425.12 : x
  2. Step 2: Convert to fraction form
    945.22/1,418.32 = 425.12/x
  3. Step 3: Cross multiply
    945.22x = 1,418.32 × 425.12
  4. Step 4: Simplify right side
    945.22x = 602,950.53
  5. Step 5: Solve for x
    x = 602,950.53/945.22
  6. Step 6: Final answer
    x = 637.89

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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.