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Finding the Fourth Proportional to 19,791.40, 29,643.90 and 19,359.40

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Solution

The fourth proportional to 19,791.40, 29,643.90 and 19,359.40 is: 28,996.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,791.40 : 29,643.90 = 19,359.40 : x
  2. Step 2: Convert to fraction form
    19,791.40/29,643.90 = 19,359.40/x
  3. Step 3: Cross multiply
    19,791.40x = 29,643.90 × 19,359.40
  4. Step 4: Simplify right side
    19,791.40x = 573,888,117.66
  5. Step 5: Solve for x
    x = 573,888,117.66/19,791.40
  6. Step 6: Final answer
    x = 28,996.84

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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.