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Finding the Fourth Proportional to 28,603.90, 42,906.45 and 20,135.80

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Solution

The fourth proportional to 28,603.90, 42,906.45 and 20,135.80 is: 30,204.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,603.90 : 42,906.45 = 20,135.80 : x
  2. Step 2: Convert to fraction form
    28,603.90/42,906.45 = 20,135.80/x
  3. Step 3: Cross multiply
    28,603.90x = 42,906.45 × 20,135.80
  4. Step 4: Simplify right side
    28,603.90x = 863,955,695.91
  5. Step 5: Solve for x
    x = 863,955,695.91/28,603.90
  6. Step 6: Final answer
    x = 30,204.12

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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.