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Finding the Fourth Proportional to 343,386.80, 515,080.20 and 143,640.80

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Solution

The fourth proportional to 343,386.80, 515,080.20 and 143,640.80 is: 215,461.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,386.80 : 515,080.20 = 143,640.80 : x
  2. Step 2: Convert to fraction form
    343,386.80/515,080.20 = 143,640.80/x
  3. Step 3: Cross multiply
    343,386.80x = 515,080.20 × 143,640.80
  4. Step 4: Simplify right side
    343,386.80x = 73,986,531,992.16
  5. Step 5: Solve for x
    x = 73,986,531,992.16/343,386.80
  6. Step 6: Final answer
    x = 215,461.20

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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.