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Finding the Fourth Proportional to 86,906.40, 130,359.60 and 65,911.20

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Solution

The fourth proportional to 86,906.40, 130,359.60 and 65,911.20 is: 98,866.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,906.40 : 130,359.60 = 65,911.20 : x
  2. Step 2: Convert to fraction form
    86,906.40/130,359.60 = 65,911.20/x
  3. Step 3: Cross multiply
    86,906.40x = 130,359.60 × 65,911.20
  4. Step 4: Simplify right side
    86,906.40x = 8,592,157,667.52
  5. Step 5: Solve for x
    x = 8,592,157,667.52/86,906.40
  6. Step 6: Final answer
    x = 98,866.80

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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.