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Finding the Fourth Proportional to 128,692.56, 177,603 and 72,122.16

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Solution

The fourth proportional to 128,692.56, 177,603 and 72,122.16 is: 99,532.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,692.56 : 177,603 = 72,122.16 : x
  2. Step 2: Convert to fraction form
    128,692.56/177,603 = 72,122.16/x
  3. Step 3: Cross multiply
    128,692.56x = 177,603 × 72,122.16
  4. Step 4: Simplify right side
    128,692.56x = 12,809,111,982.48
  5. Step 5: Solve for x
    x = 12,809,111,982.48/128,692.56
  6. Step 6: Final answer
    x = 99,532.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.