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Finding the Fourth Proportional to 128,210.63, 176,930.73 and 71,622

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Solution

The fourth proportional to 128,210.63, 176,930.73 and 71,622 is: 98,838.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,210.63 : 176,930.73 = 71,622 : x
  2. Step 2: Convert to fraction form
    128,210.63/176,930.73 = 71,622/x
  3. Step 3: Cross multiply
    128,210.63x = 176,930.73 × 71,622
  4. Step 4: Simplify right side
    128,210.63x = 12,672,132,744.06
  5. Step 5: Solve for x
    x = 12,672,132,744.06/128,210.63
  6. Step 6: Final answer
    x = 98,838.40

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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.