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Finding the Fourth Proportional to 945.44, 1,411.96 and 815.70

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Solution

The fourth proportional to 945.44, 1,411.96 and 815.70 is: 1,218.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.44 : 1,411.96 = 815.70 : x
  2. Step 2: Convert to fraction form
    945.44/1,411.96 = 815.70/x
  3. Step 3: Cross multiply
    945.44x = 1,411.96 × 815.70
  4. Step 4: Simplify right side
    945.44x = 1,151,735.77
  5. Step 5: Solve for x
    x = 1,151,735.77/945.44
  6. Step 6: Final answer
    x = 1,218.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.