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Finding the Fourth Proportional to 3,330.68, 4,996.80 and 990.70

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Solution

The fourth proportional to 3,330.68, 4,996.80 and 990.70 is: 1,486.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,330.68 : 4,996.80 = 990.70 : x
  2. Step 2: Convert to fraction form
    3,330.68/4,996.80 = 990.70/x
  3. Step 3: Cross multiply
    3,330.68x = 4,996.80 × 990.70
  4. Step 4: Simplify right side
    3,330.68x = 4,950,329.76
  5. Step 5: Solve for x
    x = 4,950,329.76/3,330.68
  6. Step 6: Final answer
    x = 1,486.28

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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.