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Finding the Fourth Proportional to 20,651.70, 30,989.70 and 7,505.40

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Solution

The fourth proportional to 20,651.70, 30,989.70 and 7,505.40 is: 11,262.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,651.70 : 30,989.70 = 7,505.40 : x
  2. Step 2: Convert to fraction form
    20,651.70/30,989.70 = 7,505.40/x
  3. Step 3: Cross multiply
    20,651.70x = 30,989.70 × 7,505.40
  4. Step 4: Simplify right side
    20,651.70x = 232,590,094.38
  5. Step 5: Solve for x
    x = 232,590,094.38/20,651.70
  6. Step 6: Final answer
    x = 11,262.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.