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Finding the Fourth Proportional to 515,612.78, 711,534.93 and 286,156.75

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Solution

The fourth proportional to 515,612.78, 711,534.93 and 286,156.75 is: 394,890.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,612.78 : 711,534.93 = 286,156.75 : x
  2. Step 2: Convert to fraction form
    515,612.78/711,534.93 = 286,156.75/x
  3. Step 3: Cross multiply
    515,612.78x = 711,534.93 × 286,156.75
  4. Step 4: Simplify right side
    515,612.78x = 203,610,523,080.28
  5. Step 5: Solve for x
    x = 203,610,523,080.28/515,612.78
  6. Step 6: Final answer
    x = 394,890.37

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Double scale
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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.