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Finding the Fourth Proportional to 28,407.85, 42,611.87 and 8,686.37

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Solution

The fourth proportional to 28,407.85, 42,611.87 and 8,686.37 is: 13,029.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,407.85 : 42,611.87 = 8,686.37 : x
  2. Step 2: Convert to fraction form
    28,407.85/42,611.87 = 8,686.37/x
  3. Step 3: Cross multiply
    28,407.85x = 42,611.87 × 8,686.37
  4. Step 4: Simplify right side
    28,407.85x = 370,142,597.46
  5. Step 5: Solve for x
    x = 370,142,597.46/28,407.85
  6. Step 6: Final answer
    x = 13,029.59

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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.