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Finding the Fourth Proportional to 128,209.50, 176,929.20 and 71,622.18

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Solution

The fourth proportional to 128,209.50, 176,929.20 and 71,622.18 is: 98,838.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,209.50 : 176,929.20 = 71,622.18 : x
  2. Step 2: Convert to fraction form
    128,209.50/176,929.20 = 71,622.18/x
  3. Step 3: Cross multiply
    128,209.50x = 176,929.20 × 71,622.18
  4. Step 4: Simplify right side
    128,209.50x = 12,672,055,009.66
  5. Step 5: Solve for x
    x = 12,672,055,009.66/128,209.50
  6. Step 6: Final answer
    x = 98,838.66

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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.