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Finding the Fourth Proportional to 990.99, 1,486.28 and 332.81

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Solution

The fourth proportional to 990.99, 1,486.28 and 332.81 is: 499.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.99 : 1,486.28 = 332.81 : x
  2. Step 2: Convert to fraction form
    990.99/1,486.28 = 332.81/x
  3. Step 3: Cross multiply
    990.99x = 1,486.28 × 332.81
  4. Step 4: Simplify right side
    990.99x = 494,639.75
  5. Step 5: Solve for x
    x = 494,639.75/990.99
  6. Step 6: Final answer
    x = 499.14

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Half scale
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Double scale
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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.