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Finding the Fourth Proportional to 28,591.80, 42,935.22 and 19,291.66

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Solution

The fourth proportional to 28,591.80, 42,935.22 and 19,291.66 is: 28,969.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,591.80 : 42,935.22 = 19,291.66 : x
  2. Step 2: Convert to fraction form
    28,591.80/42,935.22 = 19,291.66/x
  3. Step 3: Cross multiply
    28,591.80x = 42,935.22 × 19,291.66
  4. Step 4: Simplify right side
    28,591.80x = 828,291,666.27
  5. Step 5: Solve for x
    x = 828,291,666.27/28,591.80
  6. Step 6: Final answer
    x = 28,969.55

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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.