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Finding the Fourth Proportional to 1,638.93, 2,261.79 and 930.77

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Solution

The fourth proportional to 1,638.93, 2,261.79 and 930.77 is: 1,284.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.93 : 2,261.79 = 930.77 : x
  2. Step 2: Convert to fraction form
    1,638.93/2,261.79 = 930.77/x
  3. Step 3: Cross multiply
    1,638.93x = 2,261.79 × 930.77
  4. Step 4: Simplify right side
    1,638.93x = 2,105,194.97
  5. Step 5: Solve for x
    x = 2,105,194.97/1,638.93
  6. Step 6: Final answer
    x = 1,284.49

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1.5x scale

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.