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Finding the Fourth Proportional to 640,206.36, 961,308.30 and 611,811.84

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Solution

The fourth proportional to 640,206.36, 961,308.30 and 611,811.84 is: 918,672.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,206.36 : 961,308.30 = 611,811.84 : x
  2. Step 2: Convert to fraction form
    640,206.36/961,308.30 = 611,811.84/x
  3. Step 3: Cross multiply
    640,206.36x = 961,308.30 × 611,811.84
  4. Step 4: Simplify right side
    640,206.36x = 588,139,799,830.27
  5. Step 5: Solve for x
    x = 588,139,799,830.27/640,206.36
  6. Step 6: Final answer
    x = 918,672.22

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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.