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Finding the Fourth Proportional to 28,607.60, 42,940.20 and 13,828.40

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Solution

The fourth proportional to 28,607.60, 42,940.20 and 13,828.40 is: 20,756.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,607.60 : 42,940.20 = 13,828.40 : x
  2. Step 2: Convert to fraction form
    28,607.60/42,940.20 = 13,828.40/x
  3. Step 3: Cross multiply
    28,607.60x = 42,940.20 × 13,828.40
  4. Step 4: Simplify right side
    28,607.60x = 593,794,261.68
  5. Step 5: Solve for x
    x = 593,794,261.68/28,607.60
  6. Step 6: Final answer
    x = 20,756.52

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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.