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Finding the Fourth Proportional to 399,315.21, 551,050.81 and 218,026.57

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Solution

The fourth proportional to 399,315.21, 551,050.81 and 218,026.57 is: 300,874.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,315.21 : 551,050.81 = 218,026.57 : x
  2. Step 2: Convert to fraction form
    399,315.21/551,050.81 = 218,026.57/x
  3. Step 3: Cross multiply
    399,315.21x = 551,050.81 × 218,026.57
  4. Step 4: Simplify right side
    399,315.21x = 120,143,718,000.02
  5. Step 5: Solve for x
    x = 120,143,718,000.02/399,315.21
  6. Step 6: Final answer
    x = 300,874.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.