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Finding the Fourth Proportional to 219,211.40, 328,233.90 and 139,896.20

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Solution

The fourth proportional to 219,211.40, 328,233.90 and 139,896.20 is: 209,472.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,211.40 : 328,233.90 = 139,896.20 : x
  2. Step 2: Convert to fraction form
    219,211.40/328,233.90 = 139,896.20/x
  3. Step 3: Cross multiply
    219,211.40x = 328,233.90 × 139,896.20
  4. Step 4: Simplify right side
    219,211.40x = 45,918,675,321.18
  5. Step 5: Solve for x
    x = 45,918,675,321.18/219,211.40
  6. Step 6: Final answer
    x = 209,472.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.