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Finding the Fourth Proportional to 20,603.70, 30,732.34 and 18,711.72

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Solution

The fourth proportional to 20,603.70, 30,732.34 and 18,711.72 is: 27,910.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.70 : 30,732.34 = 18,711.72 : x
  2. Step 2: Convert to fraction form
    20,603.70/30,732.34 = 18,711.72/x
  3. Step 3: Cross multiply
    20,603.70x = 30,732.34 × 18,711.72
  4. Step 4: Simplify right side
    20,603.70x = 575,054,941.02
  5. Step 5: Solve for x
    x = 575,054,941.02/20,603.70
  6. Step 6: Final answer
    x = 27,910.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.