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Finding the Fourth Proportional to 28,303.29, 42,455.88 and 12,720.96

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Solution

The fourth proportional to 28,303.29, 42,455.88 and 12,720.96 is: 19,081.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,303.29 : 42,455.88 = 12,720.96 : x
  2. Step 2: Convert to fraction form
    28,303.29/42,455.88 = 12,720.96/x
  3. Step 3: Cross multiply
    28,303.29x = 42,455.88 × 12,720.96
  4. Step 4: Simplify right side
    28,303.29x = 540,079,551.24
  5. Step 5: Solve for x
    x = 540,079,551.24/28,303.29
  6. Step 6: Final answer
    x = 19,081.86

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.