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Finding the Fourth Proportional to 28,527.86, 39,368.11 and 15,780.04

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Solution

The fourth proportional to 28,527.86, 39,368.11 and 15,780.04 is: 21,776.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,527.86 : 39,368.11 = 15,780.04 : x
  2. Step 2: Convert to fraction form
    28,527.86/39,368.11 = 15,780.04/x
  3. Step 3: Cross multiply
    28,527.86x = 39,368.11 × 15,780.04
  4. Step 4: Simplify right side
    28,527.86x = 621,230,319.68
  5. Step 5: Solve for x
    x = 621,230,319.68/28,527.86
  6. Step 6: Final answer
    x = 21,776.27

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.