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Finding the Fourth Proportional to 343,371.09, 515,045.70 and 90,643.80

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Solution

The fourth proportional to 343,371.09, 515,045.70 and 90,643.80 is: 135,962.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,371.09 : 515,045.70 = 90,643.80 : x
  2. Step 2: Convert to fraction form
    343,371.09/515,045.70 = 90,643.80/x
  3. Step 3: Cross multiply
    343,371.09x = 515,045.70 × 90,643.80
  4. Step 4: Simplify right side
    343,371.09x = 46,685,699,421.66
  5. Step 5: Solve for x
    x = 46,685,699,421.66/343,371.09
  6. Step 6: Final answer
    x = 135,962.81

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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.