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Finding the Fourth Proportional to 128,417, 177,220.66 and 71,055.32

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Solution

The fourth proportional to 128,417, 177,220.66 and 71,055.32 is: 98,059.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,417 : 177,220.66 = 71,055.32 : x
  2. Step 2: Convert to fraction form
    128,417/177,220.66 = 71,055.32/x
  3. Step 3: Cross multiply
    128,417x = 177,220.66 × 71,055.32
  4. Step 4: Simplify right side
    128,417x = 12,592,470,706.91
  5. Step 5: Solve for x
    x = 12,592,470,706.91/128,417
  6. Step 6: Final answer
    x = 98,059.22

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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.