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Finding the Fourth Proportional to 129,485.42, 178,706.91 and 72,907.82

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Solution

The fourth proportional to 129,485.42, 178,706.91 and 72,907.82 is: 100,622.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,485.42 : 178,706.91 = 72,907.82 : x
  2. Step 2: Convert to fraction form
    129,485.42/178,706.91 = 72,907.82/x
  3. Step 3: Cross multiply
    129,485.42x = 178,706.91 × 72,907.82
  4. Step 4: Simplify right side
    129,485.42x = 13,029,131,227.04
  5. Step 5: Solve for x
    x = 13,029,131,227.04/129,485.42
  6. Step 6: Final answer
    x = 100,622.38

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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.