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Finding the Fourth Proportional to 515,448.92, 711,355.02 and 289,109

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Solution

The fourth proportional to 515,448.92, 711,355.02 and 289,109 is: 398,990.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,448.92 : 711,355.02 = 289,109 : x
  2. Step 2: Convert to fraction form
    515,448.92/711,355.02 = 289,109/x
  3. Step 3: Cross multiply
    515,448.92x = 711,355.02 × 289,109
  4. Step 4: Simplify right side
    515,448.92x = 205,659,138,477.18
  5. Step 5: Solve for x
    x = 205,659,138,477.18/515,448.92
  6. Step 6: Final answer
    x = 398,990.34

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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.