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Finding the Fourth Proportional to 28,507.98, 42,724.28 and 20,636.80

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Solution

The fourth proportional to 28,507.98, 42,724.28 and 20,636.80 is: 30,927.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,507.98 : 42,724.28 = 20,636.80 : x
  2. Step 2: Convert to fraction form
    28,507.98/42,724.28 = 20,636.80/x
  3. Step 3: Cross multiply
    28,507.98x = 42,724.28 × 20,636.80
  4. Step 4: Simplify right side
    28,507.98x = 881,692,421.50
  5. Step 5: Solve for x
    x = 881,692,421.50/28,507.98
  6. Step 6: Final answer
    x = 30,927.92

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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.