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Finding the Fourth Proportional to 28,415.63, 42,623.41 and 7,639.13

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Solution

The fourth proportional to 28,415.63, 42,623.41 and 7,639.13 is: 11,458.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,415.63 : 42,623.41 = 7,639.13 : x
  2. Step 2: Convert to fraction form
    28,415.63/42,623.41 = 7,639.13/x
  3. Step 3: Cross multiply
    28,415.63x = 42,623.41 × 7,639.13
  4. Step 4: Simplify right side
    28,415.63x = 325,605,770.03
  5. Step 5: Solve for x
    x = 325,605,770.03/28,415.63
  6. Step 6: Final answer
    x = 11,458.69

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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.