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Finding the Fourth Proportional to 28,479.94, 42,713.34 and 8,485.36

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Solution

The fourth proportional to 28,479.94, 42,713.34 and 8,485.36 is: 12,726.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,479.94 : 42,713.34 = 8,485.36 : x
  2. Step 2: Convert to fraction form
    28,479.94/42,713.34 = 8,485.36/x
  3. Step 3: Cross multiply
    28,479.94x = 42,713.34 × 8,485.36
  4. Step 4: Simplify right side
    28,479.94x = 362,438,066.70
  5. Step 5: Solve for x
    x = 362,438,066.70/28,479.94
  6. Step 6: Final answer
    x = 12,726.08

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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.