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Finding the Fourth Proportional to 223,689.69, 308,704.55 and 128,212.29

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Solution

The fourth proportional to 223,689.69, 308,704.55 and 128,212.29 is: 176,940.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,689.69 : 308,704.55 = 128,212.29 : x
  2. Step 2: Convert to fraction form
    223,689.69/308,704.55 = 128,212.29/x
  3. Step 3: Cross multiply
    223,689.69x = 308,704.55 × 128,212.29
  4. Step 4: Simplify right side
    223,689.69x = 39,579,716,647.86
  5. Step 5: Solve for x
    x = 39,579,716,647.86/223,689.69
  6. Step 6: Final answer
    x = 176,940.28

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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.