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Finding the Fourth Proportional to 310,245.72, 428,185.43 and 189,457.03

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Solution

The fourth proportional to 310,245.72, 428,185.43 and 189,457.03 is: 261,479.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,245.72 : 428,185.43 = 189,457.03 : x
  2. Step 2: Convert to fraction form
    310,245.72/428,185.43 = 189,457.03/x
  3. Step 3: Cross multiply
    310,245.72x = 428,185.43 × 189,457.03
  4. Step 4: Simplify right side
    310,245.72x = 81,122,739,857.07
  5. Step 5: Solve for x
    x = 81,122,739,857.07/310,245.72
  6. Step 6: Final answer
    x = 261,479.00

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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.