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Finding the Fourth Proportional to 343,878.40, 515,817.60 and 217,907.20

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Solution

The fourth proportional to 343,878.40, 515,817.60 and 217,907.20 is: 326,860.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,878.40 : 515,817.60 = 217,907.20 : x
  2. Step 2: Convert to fraction form
    343,878.40/515,817.60 = 217,907.20/x
  3. Step 3: Cross multiply
    343,878.40x = 515,817.60 × 217,907.20
  4. Step 4: Simplify right side
    343,878.40x = 112,400,368,926.72
  5. Step 5: Solve for x
    x = 112,400,368,926.72/343,878.40
  6. Step 6: Final answer
    x = 326,860.80

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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.