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Finding the Fourth Proportional to 30,871.83, 42,603.93 and 18,928.29

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Solution

The fourth proportional to 30,871.83, 42,603.93 and 18,928.29 is: 26,121.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,871.83 : 42,603.93 = 18,928.29 : x
  2. Step 2: Convert to fraction form
    30,871.83/42,603.93 = 18,928.29/x
  3. Step 3: Cross multiply
    30,871.83x = 42,603.93 × 18,928.29
  4. Step 4: Simplify right side
    30,871.83x = 806,419,542.18
  5. Step 5: Solve for x
    x = 806,419,542.18/30,871.83
  6. Step 6: Final answer
    x = 26,121.53

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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.