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Finding the Fourth Proportional to 313,899.60, 470,439.80 and 145,400.40

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Solution

The fourth proportional to 313,899.60, 470,439.80 and 145,400.40 is: 217,910.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,899.60 : 470,439.80 = 145,400.40 : x
  2. Step 2: Convert to fraction form
    313,899.60/470,439.80 = 145,400.40/x
  3. Step 3: Cross multiply
    313,899.60x = 470,439.80 × 145,400.40
  4. Step 4: Simplify right side
    313,899.60x = 68,402,135,095.92
  5. Step 5: Solve for x
    x = 68,402,135,095.92/313,899.60
  6. Step 6: Final answer
    x = 217,910.87

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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.