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Finding the Fourth Proportional to 86,568.90, 129,911.40 and 30,408.90

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Solution

The fourth proportional to 86,568.90, 129,911.40 and 30,408.90 is: 45,633.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,568.90 : 129,911.40 = 30,408.90 : x
  2. Step 2: Convert to fraction form
    86,568.90/129,911.40 = 30,408.90/x
  3. Step 3: Cross multiply
    86,568.90x = 129,911.40 × 30,408.90
  4. Step 4: Simplify right side
    86,568.90x = 3,950,462,771.46
  5. Step 5: Solve for x
    x = 3,950,462,771.46/86,568.90
  6. Step 6: Final answer
    x = 45,633.74

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1.5x scale

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.