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Finding the Fourth Proportional to 215,046.99, 320,959.31 and 211,499.51

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Solution

The fourth proportional to 215,046.99, 320,959.31 and 211,499.51 is: 315,664.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,046.99 : 320,959.31 = 211,499.51 : x
  2. Step 2: Convert to fraction form
    215,046.99/320,959.31 = 211,499.51/x
  3. Step 3: Cross multiply
    215,046.99x = 320,959.31 × 211,499.51
  4. Step 4: Simplify right side
    215,046.99x = 67,882,734,132.64
  5. Step 5: Solve for x
    x = 67,882,734,132.64/215,046.99
  6. Step 6: Final answer
    x = 315,664.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.