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Finding the Fourth Proportional to 216,683.78, 299,021.90 and 121,190.40

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Solution

The fourth proportional to 216,683.78, 299,021.90 and 121,190.40 is: 167,241.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,683.78 : 299,021.90 = 121,190.40 : x
  2. Step 2: Convert to fraction form
    216,683.78/299,021.90 = 121,190.40/x
  3. Step 3: Cross multiply
    216,683.78x = 299,021.90 × 121,190.40
  4. Step 4: Simplify right side
    216,683.78x = 36,238,583,063.81
  5. Step 5: Solve for x
    x = 36,238,583,063.81/216,683.78
  6. Step 6: Final answer
    x = 167,241.79

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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.