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Finding the Fourth Proportional to 945.81, 1,418.85 and 458.80

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Solution

The fourth proportional to 945.81, 1,418.85 and 458.80 is: 688.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.81 : 1,418.85 = 458.80 : x
  2. Step 2: Convert to fraction form
    945.81/1,418.85 = 458.80/x
  3. Step 3: Cross multiply
    945.81x = 1,418.85 × 458.80
  4. Step 4: Simplify right side
    945.81x = 650,964.83
  5. Step 5: Solve for x
    x = 650,964.83/945.81
  6. Step 6: Final answer
    x = 688.26

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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.