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Finding the Fourth Proportional to 372,128.40, 521,679.60 and 372,128.40

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Solution

The fourth proportional to 372,128.40, 521,679.60 and 372,128.40 is: 521,679.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    372,128.40 : 521,679.60 = 372,128.40 : x
  2. Step 2: Convert to fraction form
    372,128.40/521,679.60 = 372,128.40/x
  3. Step 3: Cross multiply
    372,128.40x = 521,679.60 × 372,128.40
  4. Step 4: Simplify right side
    372,128.40x = 194,131,794,860.64
  5. Step 5: Solve for x
    x = 194,131,794,860.64/372,128.40
  6. Step 6: Final answer
    x = 521,679.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.