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Finding the Fourth Proportional to 1,369.68, 1,890 and 845.64

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Solution

The fourth proportional to 1,369.68, 1,890 and 845.64 is: 1,166.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.68 : 1,890 = 845.64 : x
  2. Step 2: Convert to fraction form
    1,369.68/1,890 = 845.64/x
  3. Step 3: Cross multiply
    1,369.68x = 1,890 × 845.64
  4. Step 4: Simplify right side
    1,369.68x = 1,598,259.60
  5. Step 5: Solve for x
    x = 1,598,259.60/1,369.68
  6. Step 6: Final answer
    x = 1,166.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.