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Finding the Fourth Proportional to 30,871.62, 42,603.60 and 18,928.02

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Solution

The fourth proportional to 30,871.62, 42,603.60 and 18,928.02 is: 26,121.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,871.62 : 42,603.60 = 18,928.02 : x
  2. Step 2: Convert to fraction form
    30,871.62/42,603.60 = 18,928.02/x
  3. Step 3: Cross multiply
    30,871.62x = 42,603.60 × 18,928.02
  4. Step 4: Simplify right side
    30,871.62x = 806,401,792.87
  5. Step 5: Solve for x
    x = 806,401,792.87/30,871.62
  6. Step 6: Final answer
    x = 26,121.14

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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.