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Finding the Fourth Proportional to 86,945.60, 130,418.40 and 81,070.40

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Solution

The fourth proportional to 86,945.60, 130,418.40 and 81,070.40 is: 121,605.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,945.60 : 130,418.40 = 81,070.40 : x
  2. Step 2: Convert to fraction form
    86,945.60/130,418.40 = 81,070.40/x
  3. Step 3: Cross multiply
    86,945.60x = 130,418.40 × 81,070.40
  4. Step 4: Simplify right side
    86,945.60x = 10,573,071,855.36
  5. Step 5: Solve for x
    x = 10,573,071,855.36/86,945.60
  6. Step 6: Final answer
    x = 121,605.60

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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.