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Finding the Fourth Proportional to 30,939.84, 42,675.84 and 19,756.80

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Solution

The fourth proportional to 30,939.84, 42,675.84 and 19,756.80 is: 27,250.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,939.84 : 42,675.84 = 19,756.80 : x
  2. Step 2: Convert to fraction form
    30,939.84/42,675.84 = 19,756.80/x
  3. Step 3: Cross multiply
    30,939.84x = 42,675.84 × 19,756.80
  4. Step 4: Simplify right side
    30,939.84x = 843,138,035.71
  5. Step 5: Solve for x
    x = 843,138,035.71/30,939.84
  6. Step 6: Final answer
    x = 27,250.89

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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.