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Finding the Fourth Proportional to 221,588.80, 305,938.80 and 136,830.40

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Solution

The fourth proportional to 221,588.80, 305,938.80 and 136,830.40 is: 188,916.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,588.80 : 305,938.80 = 136,830.40 : x
  2. Step 2: Convert to fraction form
    221,588.80/305,938.80 = 136,830.40/x
  3. Step 3: Cross multiply
    221,588.80x = 305,938.80 × 136,830.40
  4. Step 4: Simplify right side
    221,588.80x = 41,861,728,379.52
  5. Step 5: Solve for x
    x = 41,861,728,379.52/221,588.80
  6. Step 6: Final answer
    x = 188,916.26

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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.