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Finding the Fourth Proportional to 28,406.59, 42,610 and 8,685.11

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Solution

The fourth proportional to 28,406.59, 42,610 and 8,685.11 is: 13,027.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,406.59 : 42,610 = 8,685.11 : x
  2. Step 2: Convert to fraction form
    28,406.59/42,610 = 8,685.11/x
  3. Step 3: Cross multiply
    28,406.59x = 42,610 × 8,685.11
  4. Step 4: Simplify right side
    28,406.59x = 370,072,537.10
  5. Step 5: Solve for x
    x = 370,072,537.10/28,406.59
  6. Step 6: Final answer
    x = 13,027.70

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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.