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Finding the Fourth Proportional to 281,235.69, 421,766.61 and 81,570.75

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Solution

The fourth proportional to 281,235.69, 421,766.61 and 81,570.75 is: 122,330.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,235.69 : 421,766.61 = 81,570.75 : x
  2. Step 2: Convert to fraction form
    281,235.69/421,766.61 = 81,570.75/x
  3. Step 3: Cross multiply
    281,235.69x = 421,766.61 × 81,570.75
  4. Step 4: Simplify right side
    281,235.69x = 34,403,818,702.66
  5. Step 5: Solve for x
    x = 34,403,818,702.66/281,235.69
  6. Step 6: Final answer
    x = 122,330.91

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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.