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Finding the Fourth Proportional to 141,871.51, 212,431.83 and 85,636.45

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Solution

The fourth proportional to 141,871.51, 212,431.83 and 85,636.45 is: 128,228.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,871.51 : 212,431.83 = 85,636.45 : x
  2. Step 2: Convert to fraction form
    141,871.51/212,431.83 = 85,636.45/x
  3. Step 3: Cross multiply
    141,871.51x = 212,431.83 × 85,636.45
  4. Step 4: Simplify right side
    141,871.51x = 18,191,907,788.20
  5. Step 5: Solve for x
    x = 18,191,907,788.20/141,871.51
  6. Step 6: Final answer
    x = 128,228.06

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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.