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Finding the Fourth Proportional to 279,990.40, 419,985.60 and 210,006.40

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Solution

The fourth proportional to 279,990.40, 419,985.60 and 210,006.40 is: 315,009.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,990.40 : 419,985.60 = 210,006.40 : x
  2. Step 2: Convert to fraction form
    279,990.40/419,985.60 = 210,006.40/x
  3. Step 3: Cross multiply
    279,990.40x = 419,985.60 × 210,006.40
  4. Step 4: Simplify right side
    279,990.40x = 88,199,663,907.84
  5. Step 5: Solve for x
    x = 88,199,663,907.84/279,990.40
  6. Step 6: Final answer
    x = 315,009.60

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1.5x scale

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.