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Finding the Fourth Proportional to 128,571.32, 192,075.12 and 83,223.26

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Solution

The fourth proportional to 128,571.32, 192,075.12 and 83,223.26 is: 124,328.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,571.32 : 192,075.12 = 83,223.26 : x
  2. Step 2: Convert to fraction form
    128,571.32/192,075.12 = 83,223.26/x
  3. Step 3: Cross multiply
    128,571.32x = 192,075.12 × 83,223.26
  4. Step 4: Simplify right side
    128,571.32x = 15,985,118,374.59
  5. Step 5: Solve for x
    x = 15,985,118,374.59/128,571.32
  6. Step 6: Final answer
    x = 124,328.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.