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Finding the Fourth Proportional to 313,619.80, 470,429.70 and 76,959.40

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Solution

The fourth proportional to 313,619.80, 470,429.70 and 76,959.40 is: 115,439.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,619.80 : 470,429.70 = 76,959.40 : x
  2. Step 2: Convert to fraction form
    313,619.80/470,429.70 = 76,959.40/x
  3. Step 3: Cross multiply
    313,619.80x = 470,429.70 × 76,959.40
  4. Step 4: Simplify right side
    313,619.80x = 36,203,987,454.18
  5. Step 5: Solve for x
    x = 36,203,987,454.18/313,619.80
  6. Step 6: Final answer
    x = 115,439.10

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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.