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Finding the Fourth Proportional to 18,420.70, 25,490.55 and 15,942.10

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Solution

The fourth proportional to 18,420.70, 25,490.55 and 15,942.10 is: 22,060.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.70 : 25,490.55 = 15,942.10 : x
  2. Step 2: Convert to fraction form
    18,420.70/25,490.55 = 15,942.10/x
  3. Step 3: Cross multiply
    18,420.70x = 25,490.55 × 15,942.10
  4. Step 4: Simplify right side
    18,420.70x = 406,372,897.16
  5. Step 5: Solve for x
    x = 406,372,897.16/18,420.70
  6. Step 6: Final answer
    x = 22,060.67

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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.