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Finding the Fourth Proportional to 398,955.13, 550,556.20 and 217,666.51

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Solution

The fourth proportional to 398,955.13, 550,556.20 and 217,666.51 is: 300,378.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,955.13 : 550,556.20 = 217,666.51 : x
  2. Step 2: Convert to fraction form
    398,955.13/550,556.20 = 217,666.51/x
  3. Step 3: Cross multiply
    398,955.13x = 550,556.20 × 217,666.51
  4. Step 4: Simplify right side
    398,955.13x = 119,837,646,612.86
  5. Step 5: Solve for x
    x = 119,837,646,612.86/398,955.13
  6. Step 6: Final answer
    x = 300,378.76

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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.