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Finding the Fourth Proportional to 343,401.20, 515,101.80 and 90,681.20

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Solution

The fourth proportional to 343,401.20, 515,101.80 and 90,681.20 is: 136,021.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,401.20 : 515,101.80 = 90,681.20 : x
  2. Step 2: Convert to fraction form
    343,401.20/515,101.80 = 90,681.20/x
  3. Step 3: Cross multiply
    343,401.20x = 515,101.80 × 90,681.20
  4. Step 4: Simplify right side
    343,401.20x = 46,710,049,346.16
  5. Step 5: Solve for x
    x = 46,710,049,346.16/343,401.20
  6. Step 6: Final answer
    x = 136,021.80

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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.