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Finding the Fourth Proportional to 65,420.96, 98,137.28 and 21,051.68

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Solution

The fourth proportional to 65,420.96, 98,137.28 and 21,051.68 is: 31,579.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,420.96 : 98,137.28 = 21,051.68 : x
  2. Step 2: Convert to fraction form
    65,420.96/98,137.28 = 21,051.68/x
  3. Step 3: Cross multiply
    65,420.96x = 98,137.28 × 21,051.68
  4. Step 4: Simplify right side
    65,420.96x = 2,065,954,614.63
  5. Step 5: Solve for x
    x = 2,065,954,614.63/65,420.96
  6. Step 6: Final answer
    x = 31,579.40

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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.