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Finding the Fourth Proportional to 343,887.20, 515,903.70 and 103,981.40

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Solution

The fourth proportional to 343,887.20, 515,903.70 and 103,981.40 is: 155,994.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,887.20 : 515,903.70 = 103,981.40 : x
  2. Step 2: Convert to fraction form
    343,887.20/515,903.70 = 103,981.40/x
  3. Step 3: Cross multiply
    343,887.20x = 515,903.70 × 103,981.40
  4. Step 4: Simplify right side
    343,887.20x = 53,644,388,991.18
  5. Step 5: Solve for x
    x = 53,644,388,991.18/343,887.20
  6. Step 6: Final answer
    x = 155,994.14

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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.