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Finding the Fourth Proportional to 210,995.55, 291,207.78 and 120,381.09

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Solution

The fourth proportional to 210,995.55, 291,207.78 and 120,381.09 is: 166,145.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,995.55 : 291,207.78 = 120,381.09 : x
  2. Step 2: Convert to fraction form
    210,995.55/291,207.78 = 120,381.09/x
  3. Step 3: Cross multiply
    210,995.55x = 291,207.78 × 120,381.09
  4. Step 4: Simplify right side
    210,995.55x = 35,055,909,972.88
  5. Step 5: Solve for x
    x = 35,055,909,972.88/210,995.55
  6. Step 6: Final answer
    x = 166,145.26

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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.