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Finding the Fourth Proportional to 945.42, 1,418.70 and 397.86

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Solution

The fourth proportional to 945.42, 1,418.70 and 397.86 is: 597.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.42 : 1,418.70 = 397.86 : x
  2. Step 2: Convert to fraction form
    945.42/1,418.70 = 397.86/x
  3. Step 3: Cross multiply
    945.42x = 1,418.70 × 397.86
  4. Step 4: Simplify right side
    945.42x = 564,443.98
  5. Step 5: Solve for x
    x = 564,443.98/945.42
  6. Step 6: Final answer
    x = 597.03

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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.