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Finding the Fourth Proportional to 86,961.20, 130,368.90 and 45,408.20

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Solution

The fourth proportional to 86,961.20, 130,368.90 and 45,408.20 is: 68,074.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,961.20 : 130,368.90 = 45,408.20 : x
  2. Step 2: Convert to fraction form
    86,961.20/130,368.90 = 45,408.20/x
  3. Step 3: Cross multiply
    86,961.20x = 130,368.90 × 45,408.20
  4. Step 4: Simplify right side
    86,961.20x = 5,919,817,084.98
  5. Step 5: Solve for x
    x = 5,919,817,084.98/86,961.20
  6. Step 6: Final answer
    x = 68,074.23

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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.