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Finding the Fourth Proportional to 219,485.30, 302,874 and 128,844.96

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Solution

The fourth proportional to 219,485.30, 302,874 and 128,844.96 is: 177,796.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,485.30 : 302,874 = 128,844.96 : x
  2. Step 2: Convert to fraction form
    219,485.30/302,874 = 128,844.96/x
  3. Step 3: Cross multiply
    219,485.30x = 302,874 × 128,844.96
  4. Step 4: Simplify right side
    219,485.30x = 39,023,788,415.04
  5. Step 5: Solve for x
    x = 39,023,788,415.04/219,485.30
  6. Step 6: Final answer
    x = 177,796.82

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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.