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Finding the Fourth Proportional to 128,256.77, 176,990.72 and 71,668.14

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Solution

The fourth proportional to 128,256.77, 176,990.72 and 71,668.14 is: 98,900.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,256.77 : 176,990.72 = 71,668.14 : x
  2. Step 2: Convert to fraction form
    128,256.77/176,990.72 = 71,668.14/x
  3. Step 3: Cross multiply
    128,256.77x = 176,990.72 × 71,668.14
  4. Step 4: Simplify right side
    128,256.77x = 12,684,595,341.32
  5. Step 5: Solve for x
    x = 12,684,595,341.32/128,256.77
  6. Step 6: Final answer
    x = 98,900.01

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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.