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Finding the Fourth Proportional to 20,549, 28,362.15 and 13,366.40

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Solution

The fourth proportional to 20,549, 28,362.15 and 13,366.40 is: 18,448.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,549 : 28,362.15 = 13,366.40 : x
  2. Step 2: Convert to fraction form
    20,549/28,362.15 = 13,366.40/x
  3. Step 3: Cross multiply
    20,549x = 28,362.15 × 13,366.40
  4. Step 4: Simplify right side
    20,549x = 379,099,841.76
  5. Step 5: Solve for x
    x = 379,099,841.76/20,549
  6. Step 6: Final answer
    x = 18,448.58

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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.