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Finding the Fourth Proportional to 217,009.25, 299,485.10 and 121,515.11

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Solution

The fourth proportional to 217,009.25, 299,485.10 and 121,515.11 is: 167,697.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,009.25 : 299,485.10 = 121,515.11 : x
  2. Step 2: Convert to fraction form
    217,009.25/299,485.10 = 121,515.11/x
  3. Step 3: Cross multiply
    217,009.25x = 299,485.10 × 121,515.11
  4. Step 4: Simplify right side
    217,009.25x = 36,391,964,869.86
  5. Step 5: Solve for x
    x = 36,391,964,869.86/217,009.25
  6. Step 6: Final answer
    x = 167,697.76

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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.