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Finding the Fourth Proportional to 20,603.20, 30,969.60 and 20,214.40

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Solution

The fourth proportional to 20,603.20, 30,969.60 and 20,214.40 is: 30,385.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.20 : 30,969.60 = 20,214.40 : x
  2. Step 2: Convert to fraction form
    20,603.20/30,969.60 = 20,214.40/x
  3. Step 3: Cross multiply
    20,603.20x = 30,969.60 × 20,214.40
  4. Step 4: Simplify right side
    20,603.20x = 626,031,882.24
  5. Step 5: Solve for x
    x = 626,031,882.24/20,603.20
  6. Step 6: Final answer
    x = 30,385.18

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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.