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Finding the Fourth Proportional to 211,667.60, 292,108.20 and 120,990.80

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Solution

The fourth proportional to 211,667.60, 292,108.20 and 120,990.80 is: 166,971.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,667.60 : 292,108.20 = 120,990.80 : x
  2. Step 2: Convert to fraction form
    211,667.60/292,108.20 = 120,990.80/x
  3. Step 3: Cross multiply
    211,667.60x = 292,108.20 × 120,990.80
  4. Step 4: Simplify right side
    211,667.60x = 35,342,404,804.56
  5. Step 5: Solve for x
    x = 35,342,404,804.56/211,667.60
  6. Step 6: Final answer
    x = 166,971.25

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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.