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Finding the Fourth Proportional to 640,868.40, 960,265.80 and 403,786.80

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Solution

The fourth proportional to 640,868.40, 960,265.80 and 403,786.80 is: 605,026.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,868.40 : 960,265.80 = 403,786.80 : x
  2. Step 2: Convert to fraction form
    640,868.40/960,265.80 = 403,786.80/x
  3. Step 3: Cross multiply
    640,868.40x = 960,265.80 × 403,786.80
  4. Step 4: Simplify right side
    640,868.40x = 387,742,654,531.44
  5. Step 5: Solve for x
    x = 387,742,654,531.44/640,868.40
  6. Step 6: Final answer
    x = 605,026.95

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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.