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Finding the Fourth Proportional to 30,673.80, 42,329.12 and 20,063.21

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Solution

The fourth proportional to 30,673.80, 42,329.12 and 20,063.21 is: 27,686.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,673.80 : 42,329.12 = 20,063.21 : x
  2. Step 2: Convert to fraction form
    30,673.80/42,329.12 = 20,063.21/x
  3. Step 3: Cross multiply
    30,673.80x = 42,329.12 × 20,063.21
  4. Step 4: Simplify right side
    30,673.80x = 849,257,711.71
  5. Step 5: Solve for x
    x = 849,257,711.71/30,673.80
  6. Step 6: Final answer
    x = 27,686.75

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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.