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Finding the Fourth Proportional to 313,891.40, 470,145.90 and 272,419.40

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Solution

The fourth proportional to 313,891.40, 470,145.90 and 272,419.40 is: 408,029.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,891.40 : 470,145.90 = 272,419.40 : x
  2. Step 2: Convert to fraction form
    313,891.40/470,145.90 = 272,419.40/x
  3. Step 3: Cross multiply
    313,891.40x = 470,145.90 × 272,419.40
  4. Step 4: Simplify right side
    313,891.40x = 128,076,863,990.46
  5. Step 5: Solve for x
    x = 128,076,863,990.46/313,891.40
  6. Step 6: Final answer
    x = 408,029.22

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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.