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Finding the Fourth Proportional to 219,018.29, 302,309.88 and 128,393.87

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Solution

The fourth proportional to 219,018.29, 302,309.88 and 128,393.87 is: 177,221.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,018.29 : 302,309.88 = 128,393.87 : x
  2. Step 2: Convert to fraction form
    219,018.29/302,309.88 = 128,393.87/x
  3. Step 3: Cross multiply
    219,018.29x = 302,309.88 × 128,393.87
  4. Step 4: Simplify right side
    219,018.29x = 38,814,735,862.12
  5. Step 5: Solve for x
    x = 38,814,735,862.12/219,018.29
  6. Step 6: Final answer
    x = 177,221.44

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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.