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Finding the Fourth Proportional to 98,980.32, 148,470.48 and 81,396.84

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Solution

The fourth proportional to 98,980.32, 148,470.48 and 81,396.84 is: 122,095.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,980.32 : 148,470.48 = 81,396.84 : x
  2. Step 2: Convert to fraction form
    98,980.32/148,470.48 = 81,396.84/x
  3. Step 3: Cross multiply
    98,980.32x = 148,470.48 × 81,396.84
  4. Step 4: Simplify right side
    98,980.32x = 12,085,027,905.28
  5. Step 5: Solve for x
    x = 12,085,027,905.28/98,980.32
  6. Step 6: Final answer
    x = 122,095.26

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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.