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Finding the Fourth Proportional to 68,421.80, 94,422.12 and 40,127.60

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Solution

The fourth proportional to 68,421.80, 94,422.12 and 40,127.60 is: 55,376.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,421.80 : 94,422.12 = 40,127.60 : x
  2. Step 2: Convert to fraction form
    68,421.80/94,422.12 = 40,127.60/x
  3. Step 3: Cross multiply
    68,421.80x = 94,422.12 × 40,127.60
  4. Step 4: Simplify right side
    68,421.80x = 3,788,933,062.51
  5. Step 5: Solve for x
    x = 3,788,933,062.51/68,421.80
  6. Step 6: Final answer
    x = 55,376.11

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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.