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Finding the Fourth Proportional to 318,911.80, 478,367.70 and 303,359.80

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Solution

The fourth proportional to 318,911.80, 478,367.70 and 303,359.80 is: 455,039.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,911.80 : 478,367.70 = 303,359.80 : x
  2. Step 2: Convert to fraction form
    318,911.80/478,367.70 = 303,359.80/x
  3. Step 3: Cross multiply
    318,911.80x = 478,367.70 × 303,359.80
  4. Step 4: Simplify right side
    318,911.80x = 145,117,529,798.46
  5. Step 5: Solve for x
    x = 145,117,529,798.46/318,911.80
  6. Step 6: Final answer
    x = 455,039.70

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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.