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Finding the Fourth Proportional to 115,145.56, 172,718.34 and 65,863

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Solution

The fourth proportional to 115,145.56, 172,718.34 and 65,863 is: 98,794.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,145.56 : 172,718.34 = 65,863 : x
  2. Step 2: Convert to fraction form
    115,145.56/172,718.34 = 65,863/x
  3. Step 3: Cross multiply
    115,145.56x = 172,718.34 × 65,863
  4. Step 4: Simplify right side
    115,145.56x = 11,375,748,027.42
  5. Step 5: Solve for x
    x = 11,375,748,027.42/115,145.56
  6. Step 6: Final answer
    x = 98,794.50

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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.