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Finding the Fourth Proportional to 515,668.40, 711,611.34 and 286,212.28

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Solution

The fourth proportional to 515,668.40, 711,611.34 and 286,212.28 is: 394,966.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,668.40 : 711,611.34 = 286,212.28 : x
  2. Step 2: Convert to fraction form
    515,668.40/711,611.34 = 286,212.28/x
  3. Step 3: Cross multiply
    515,668.40x = 711,611.34 × 286,212.28
  4. Step 4: Simplify right side
    515,668.40x = 203,671,904,095.26
  5. Step 5: Solve for x
    x = 203,671,904,095.26/515,668.40
  6. Step 6: Final answer
    x = 394,966.81

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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.