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Finding the Fourth Proportional to 28,121.40, 42,230.70 and 14,999.40

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Solution

The fourth proportional to 28,121.40, 42,230.70 and 14,999.40 is: 22,525.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,121.40 : 42,230.70 = 14,999.40 : x
  2. Step 2: Convert to fraction form
    28,121.40/42,230.70 = 14,999.40/x
  3. Step 3: Cross multiply
    28,121.40x = 42,230.70 × 14,999.40
  4. Step 4: Simplify right side
    28,121.40x = 633,435,161.58
  5. Step 5: Solve for x
    x = 633,435,161.58/28,121.40
  6. Step 6: Final answer
    x = 22,525.02

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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.