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Finding the Fourth Proportional to 343,415.80, 515,123.70 and 143,669.80

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Solution

The fourth proportional to 343,415.80, 515,123.70 and 143,669.80 is: 215,504.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,415.80 : 515,123.70 = 143,669.80 : x
  2. Step 2: Convert to fraction form
    343,415.80/515,123.70 = 143,669.80/x
  3. Step 3: Cross multiply
    343,415.80x = 515,123.70 × 143,669.80
  4. Step 4: Simplify right side
    343,415.80x = 74,007,718,954.26
  5. Step 5: Solve for x
    x = 74,007,718,954.26/343,415.80
  6. Step 6: Final answer
    x = 215,504.70

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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.