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Finding the Fourth Proportional to 30,981.72, 42,757.02 and 18,235.56

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Solution

The fourth proportional to 30,981.72, 42,757.02 and 18,235.56 is: 25,166.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,981.72 : 42,757.02 = 18,235.56 : x
  2. Step 2: Convert to fraction form
    30,981.72/42,757.02 = 18,235.56/x
  3. Step 3: Cross multiply
    30,981.72x = 42,757.02 × 18,235.56
  4. Step 4: Simplify right side
    30,981.72x = 779,698,203.63
  5. Step 5: Solve for x
    x = 779,698,203.63/30,981.72
  6. Step 6: Final answer
    x = 25,166.40

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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.