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Finding the Fourth Proportional to 28,408.34, 42,612.50 and 8,686.89

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Solution

The fourth proportional to 28,408.34, 42,612.50 and 8,686.89 is: 13,030.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,408.34 : 42,612.50 = 8,686.89 : x
  2. Step 2: Convert to fraction form
    28,408.34/42,612.50 = 8,686.89/x
  3. Step 3: Cross multiply
    28,408.34x = 42,612.50 × 8,686.89
  4. Step 4: Simplify right side
    28,408.34x = 370,170,100.13
  5. Step 5: Solve for x
    x = 370,170,100.13/28,408.34
  6. Step 6: Final answer
    x = 13,030.33

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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.