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Finding the Fourth Proportional to 68,456.40, 102,684.80 and 21,071.13

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Solution

The fourth proportional to 68,456.40, 102,684.80 and 21,071.13 is: 31,606.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,456.40 : 102,684.80 = 21,071.13 : x
  2. Step 2: Convert to fraction form
    68,456.40/102,684.80 = 21,071.13/x
  3. Step 3: Cross multiply
    68,456.40x = 102,684.80 × 21,071.13
  4. Step 4: Simplify right side
    68,456.40x = 2,163,684,769.82
  5. Step 5: Solve for x
    x = 2,163,684,769.82/68,456.40
  6. Step 6: Final answer
    x = 31,606.76

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1.5x scale

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.