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Finding the Fourth Proportional to 313,639.80, 470,459.70 and 76,979.40

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Solution

The fourth proportional to 313,639.80, 470,459.70 and 76,979.40 is: 115,469.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,639.80 : 470,459.70 = 76,979.40 : x
  2. Step 2: Convert to fraction form
    313,639.80/470,459.70 = 76,979.40/x
  3. Step 3: Cross multiply
    313,639.80x = 470,459.70 × 76,979.40
  4. Step 4: Simplify right side
    313,639.80x = 36,215,705,430.18
  5. Step 5: Solve for x
    x = 36,215,705,430.18/313,639.80
  6. Step 6: Final answer
    x = 115,469.10

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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.