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Finding the Fourth Proportional to 393,128.25, 589,692.38 and 112,645.50

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Solution

The fourth proportional to 393,128.25, 589,692.38 and 112,645.50 is: 168,968.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,128.25 : 589,692.38 = 112,645.50 : x
  2. Step 2: Convert to fraction form
    393,128.25/589,692.38 = 112,645.50/x
  3. Step 3: Cross multiply
    393,128.25x = 589,692.38 × 112,645.50
  4. Step 4: Simplify right side
    393,128.25x = 66,426,192,428.06
  5. Step 5: Solve for x
    x = 66,426,192,428.06/393,128.25
  6. Step 6: Final answer
    x = 168,968.25

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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.