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Finding the Fourth Proportional to 86,814.40, 130,221.60 and 65,819.20

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Solution

The fourth proportional to 86,814.40, 130,221.60 and 65,819.20 is: 98,728.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,814.40 : 130,221.60 = 65,819.20 : x
  2. Step 2: Convert to fraction form
    86,814.40/130,221.60 = 65,819.20/x
  3. Step 3: Cross multiply
    86,814.40x = 130,221.60 × 65,819.20
  4. Step 4: Simplify right side
    86,814.40x = 8,571,081,534.72
  5. Step 5: Solve for x
    x = 8,571,081,534.72/86,814.40
  6. Step 6: Final answer
    x = 98,728.80

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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.