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Finding the Fourth Proportional to 18,420.56, 25,400.25 and 12,441.85

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Solution

The fourth proportional to 18,420.56, 25,400.25 and 12,441.85 is: 17,156.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.56 : 25,400.25 = 12,441.85 : x
  2. Step 2: Convert to fraction form
    18,420.56/25,400.25 = 12,441.85/x
  3. Step 3: Cross multiply
    18,420.56x = 25,400.25 × 12,441.85
  4. Step 4: Simplify right side
    18,420.56x = 316,026,036.96
  5. Step 5: Solve for x
    x = 316,026,036.96/18,420.56
  6. Step 6: Final answer
    x = 17,156.16

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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.