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Finding the Fourth Proportional to 135,408.96, 186,885 and 84,430

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Solution

The fourth proportional to 135,408.96, 186,885 and 84,430 is: 116,526.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,408.96 : 186,885 = 84,430 : x
  2. Step 2: Convert to fraction form
    135,408.96/186,885 = 84,430/x
  3. Step 3: Cross multiply
    135,408.96x = 186,885 × 84,430
  4. Step 4: Simplify right side
    135,408.96x = 15,778,700,550
  5. Step 5: Solve for x
    x = 15,778,700,550/135,408.96
  6. Step 6: Final answer
    x = 116,526.27

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Why These Related Problems?

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