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Finding the Fourth Proportional to 68,701.51, 103,066.96 and 21,315.58

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Solution

The fourth proportional to 68,701.51, 103,066.96 and 21,315.58 is: 31,977.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,701.51 : 103,066.96 = 21,315.58 : x
  2. Step 2: Convert to fraction form
    68,701.51/103,066.96 = 21,315.58/x
  3. Step 3: Cross multiply
    68,701.51x = 103,066.96 × 21,315.58
  4. Step 4: Simplify right side
    68,701.51x = 2,196,931,720.28
  5. Step 5: Solve for x
    x = 2,196,931,720.28/68,701.51
  6. Step 6: Final answer
    x = 31,977.93

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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.