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Finding the Fourth Proportional to 515,662.91, 772,703.19 and 215,979.51

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Solution

The fourth proportional to 515,662.91, 772,703.19 and 215,979.51 is: 323,637.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,662.91 : 772,703.19 = 215,979.51 : x
  2. Step 2: Convert to fraction form
    515,662.91/772,703.19 = 215,979.51/x
  3. Step 3: Cross multiply
    515,662.91x = 772,703.19 × 215,979.51
  4. Step 4: Simplify right side
    515,662.91x = 166,888,056,351.64
  5. Step 5: Solve for x
    x = 166,888,056,351.64/515,662.91
  6. Step 6: Final answer
    x = 323,637.89

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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.