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Finding the Fourth Proportional to 65,479, 98,220.94 and 21,106.40

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Solution

The fourth proportional to 65,479, 98,220.94 and 21,106.40 is: 31,660.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,479 : 98,220.94 = 21,106.40 : x
  2. Step 2: Convert to fraction form
    65,479/98,220.94 = 21,106.40/x
  3. Step 3: Cross multiply
    65,479x = 98,220.94 × 21,106.40
  4. Step 4: Simplify right side
    65,479x = 2,073,090,448.02
  5. Step 5: Solve for x
    x = 2,073,090,448.02/65,479
  6. Step 6: Final answer
    x = 31,660.39

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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.