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Finding the Fourth Proportional to 28,407.04, 42,609 and 8,685.58

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Solution

The fourth proportional to 28,407.04, 42,609 and 8,685.58 is: 13,027.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,407.04 : 42,609 = 8,685.58 : x
  2. Step 2: Convert to fraction form
    28,407.04/42,609 = 8,685.58/x
  3. Step 3: Cross multiply
    28,407.04x = 42,609 × 8,685.58
  4. Step 4: Simplify right side
    28,407.04x = 370,083,878.22
  5. Step 5: Solve for x
    x = 370,083,878.22/28,407.04
  6. Step 6: Final answer
    x = 13,027.89

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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.