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Finding the Fourth Proportional to 1,404, 1,936.80 and 931.74

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Solution

The fourth proportional to 1,404, 1,936.80 and 931.74 is: 1,285.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,404 : 1,936.80 = 931.74 : x
  2. Step 2: Convert to fraction form
    1,404/1,936.80 = 931.74/x
  3. Step 3: Cross multiply
    1,404x = 1,936.80 × 931.74
  4. Step 4: Simplify right side
    1,404x = 1,804,594.03
  5. Step 5: Solve for x
    x = 1,804,594.03/1,404
  6. Step 6: Final answer
    x = 1,285.32

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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.