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Finding the Fourth Proportional to 990.99, 1,485.47 and 716.40

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Solution

The fourth proportional to 990.99, 1,485.47 and 716.40 is: 1,073.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.99 : 1,485.47 = 716.40 : x
  2. Step 2: Convert to fraction form
    990.99/1,485.47 = 716.40/x
  3. Step 3: Cross multiply
    990.99x = 1,485.47 × 716.40
  4. Step 4: Simplify right side
    990.99x = 1,064,179.70
  5. Step 5: Solve for x
    x = 1,064,179.70/990.99
  6. Step 6: Final answer
    x = 1,073.86

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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.