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Finding the Fourth Proportional to 1,865.76, 2,798.97 and 769.51

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Solution

The fourth proportional to 1,865.76, 2,798.97 and 769.51 is: 1,154.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,865.76 : 2,798.97 = 769.51 : x
  2. Step 2: Convert to fraction form
    1,865.76/2,798.97 = 769.51/x
  3. Step 3: Cross multiply
    1,865.76x = 2,798.97 × 769.51
  4. Step 4: Simplify right side
    1,865.76x = 2,153,835.40
  5. Step 5: Solve for x
    x = 2,153,835.40/1,865.76
  6. Step 6: Final answer
    x = 1,154.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.