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Finding the Fourth Proportional to 218,958.72, 302,165.22 and 128,368.32

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Solution

The fourth proportional to 218,958.72, 302,165.22 and 128,368.32 is: 177,149.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,958.72 : 302,165.22 = 128,368.32 : x
  2. Step 2: Convert to fraction form
    218,958.72/302,165.22 = 128,368.32/x
  3. Step 3: Cross multiply
    218,958.72x = 302,165.22 × 128,368.32
  4. Step 4: Simplify right side
    218,958.72x = 38,788,441,653.83
  5. Step 5: Solve for x
    x = 38,788,441,653.83/218,958.72
  6. Step 6: Final answer
    x = 177,149.56

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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.