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Finding the Fourth Proportional to 28,584.60, 42,901.20 and 12,813.90

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Solution

The fourth proportional to 28,584.60, 42,901.20 and 12,813.90 is: 19,231.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,584.60 : 42,901.20 = 12,813.90 : x
  2. Step 2: Convert to fraction form
    28,584.60/42,901.20 = 12,813.90/x
  3. Step 3: Cross multiply
    28,584.60x = 42,901.20 × 12,813.90
  4. Step 4: Simplify right side
    28,584.60x = 549,731,686.68
  5. Step 5: Solve for x
    x = 549,731,686.68/28,584.60
  6. Step 6: Final answer
    x = 19,231.74

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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.