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Finding the Fourth Proportional to 85,878.63, 128,697.86 and 73,162.14

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Solution

The fourth proportional to 85,878.63, 128,697.86 and 73,162.14 is: 109,640.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,878.63 : 128,697.86 = 73,162.14 : x
  2. Step 2: Convert to fraction form
    85,878.63/128,697.86 = 73,162.14/x
  3. Step 3: Cross multiply
    85,878.63x = 128,697.86 × 73,162.14
  4. Step 4: Simplify right side
    85,878.63x = 9,415,810,551.31
  5. Step 5: Solve for x
    x = 9,415,810,551.31/85,878.63
  6. Step 6: Final answer
    x = 109,640.90

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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.