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Finding the Fourth Proportional to 515,129.55, 710,921.34 and 285,760.79

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Solution

The fourth proportional to 515,129.55, 710,921.34 and 285,760.79 is: 394,373.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,129.55 : 710,921.34 = 285,760.79 : x
  2. Step 2: Convert to fraction form
    515,129.55/710,921.34 = 285,760.79/x
  3. Step 3: Cross multiply
    515,129.55x = 710,921.34 × 285,760.79
  4. Step 4: Simplify right side
    515,129.55x = 203,153,443,746.26
  5. Step 5: Solve for x
    x = 203,153,443,746.26/515,129.55
  6. Step 6: Final answer
    x = 394,373.50

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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.