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Finding the Fourth Proportional to 28,645.86, 42,970.86 and 11,989.14

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Solution

The fourth proportional to 28,645.86, 42,970.86 and 11,989.14 is: 17,984.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,645.86 : 42,970.86 = 11,989.14 : x
  2. Step 2: Convert to fraction form
    28,645.86/42,970.86 = 11,989.14/x
  3. Step 3: Cross multiply
    28,645.86x = 42,970.86 × 11,989.14
  4. Step 4: Simplify right side
    28,645.86x = 515,183,441.61
  5. Step 5: Solve for x
    x = 515,183,441.61/28,645.86
  6. Step 6: Final answer
    x = 17,984.57

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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.