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Finding the Fourth Proportional to 84,611, 126,918.54 and 28,451.84

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Solution

The fourth proportional to 84,611, 126,918.54 and 28,451.84 is: 42,678.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,611 : 126,918.54 = 28,451.84 : x
  2. Step 2: Convert to fraction form
    84,611/126,918.54 = 28,451.84/x
  3. Step 3: Cross multiply
    84,611x = 126,918.54 × 28,451.84
  4. Step 4: Simplify right side
    84,611x = 3,611,065,993.11
  5. Step 5: Solve for x
    x = 3,611,065,993.11/84,611
  6. Step 6: Final answer
    x = 42,678.45

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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.