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Finding the Fourth Proportional to 30,940.80, 42,715.80 and 21,394.68

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Solution

The fourth proportional to 30,940.80, 42,715.80 and 21,394.68 is: 29,536.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,940.80 : 42,715.80 = 21,394.68 : x
  2. Step 2: Convert to fraction form
    30,940.80/42,715.80 = 21,394.68/x
  3. Step 3: Cross multiply
    30,940.80x = 42,715.80 × 21,394.68
  4. Step 4: Simplify right side
    30,940.80x = 913,890,871.94
  5. Step 5: Solve for x
    x = 913,890,871.94/30,940.80
  6. Step 6: Final answer
    x = 29,536.76

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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.