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Finding the Fourth Proportional to 343,878.20, 515,890.20 and 103,972.40

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Solution

The fourth proportional to 343,878.20, 515,890.20 and 103,972.40 is: 155,980.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,878.20 : 515,890.20 = 103,972.40 : x
  2. Step 2: Convert to fraction form
    343,878.20/515,890.20 = 103,972.40/x
  3. Step 3: Cross multiply
    343,878.20x = 515,890.20 × 103,972.40
  4. Step 4: Simplify right side
    343,878.20x = 53,638,342,230.48
  5. Step 5: Solve for x
    x = 53,638,342,230.48/343,878.20
  6. Step 6: Final answer
    x = 155,980.64

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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.