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Finding the Fourth Proportional to 243,071.90, 335,405.63 and 135,621.05

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Solution

The fourth proportional to 243,071.90, 335,405.63 and 135,621.05 is: 187,138.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,071.90 : 335,405.63 = 135,621.05 : x
  2. Step 2: Convert to fraction form
    243,071.90/335,405.63 = 135,621.05/x
  3. Step 3: Cross multiply
    243,071.90x = 335,405.63 × 135,621.05
  4. Step 4: Simplify right side
    243,071.90x = 45,488,061,361.38
  5. Step 5: Solve for x
    x = 45,488,061,361.38/243,071.90
  6. Step 6: Final answer
    x = 187,138.30

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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.