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Finding the Fourth Proportional to 28,643.54, 42,957 and 12,003.12

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Solution

The fourth proportional to 28,643.54, 42,957 and 12,003.12 is: 18,001.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,643.54 : 42,957 = 12,003.12 : x
  2. Step 2: Convert to fraction form
    28,643.54/42,957 = 12,003.12/x
  3. Step 3: Cross multiply
    28,643.54x = 42,957 × 12,003.12
  4. Step 4: Simplify right side
    28,643.54x = 515,618,025.84
  5. Step 5: Solve for x
    x = 515,618,025.84/28,643.54
  6. Step 6: Final answer
    x = 18,001.20

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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.