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Finding the Fourth Proportional to 111,720.80, 154,113.60 and 70,809.92

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Solution

The fourth proportional to 111,720.80, 154,113.60 and 70,809.92 is: 97,678.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,720.80 : 154,113.60 = 70,809.92 : x
  2. Step 2: Convert to fraction form
    111,720.80/154,113.60 = 70,809.92/x
  3. Step 3: Cross multiply
    111,720.80x = 154,113.60 × 70,809.92
  4. Step 4: Simplify right side
    111,720.80x = 10,912,771,686.91
  5. Step 5: Solve for x
    x = 10,912,771,686.91/111,720.80
  6. Step 6: Final answer
    x = 97,678.96

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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.