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Finding the Fourth Proportional to 395,012.79, 545,113.77 and 213,720.74

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Solution

The fourth proportional to 395,012.79, 545,113.77 and 213,720.74 is: 294,932.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,012.79 : 545,113.77 = 213,720.74 : x
  2. Step 2: Convert to fraction form
    395,012.79/545,113.77 = 213,720.74/x
  3. Step 3: Cross multiply
    395,012.79x = 545,113.77 × 213,720.74
  4. Step 4: Simplify right side
    395,012.79x = 116,502,115,583.02
  5. Step 5: Solve for x
    x = 116,502,115,583.02/395,012.79
  6. Step 6: Final answer
    x = 294,932.51

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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.