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Finding the Fourth Proportional to 945.70, 1,418.55 and 515.59

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Solution

The fourth proportional to 945.70, 1,418.55 and 515.59 is: 773.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.70 : 1,418.55 = 515.59 : x
  2. Step 2: Convert to fraction form
    945.70/1,418.55 = 515.59/x
  3. Step 3: Cross multiply
    945.70x = 1,418.55 × 515.59
  4. Step 4: Simplify right side
    945.70x = 731,390.19
  5. Step 5: Solve for x
    x = 731,390.19/945.70
  6. Step 6: Final answer
    x = 773.39

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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.