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Finding the Fourth Proportional to 68,100.68, 93,990.38 and 39,421.10

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Solution

The fourth proportional to 68,100.68, 93,990.38 and 39,421.10 is: 54,407.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,100.68 : 93,990.38 = 39,421.10 : x
  2. Step 2: Convert to fraction form
    68,100.68/93,990.38 = 39,421.10/x
  3. Step 3: Cross multiply
    68,100.68x = 93,990.38 × 39,421.10
  4. Step 4: Simplify right side
    68,100.68x = 3,705,203,501.96
  5. Step 5: Solve for x
    x = 3,705,203,501.96/68,100.68
  6. Step 6: Final answer
    x = 54,407.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.