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Finding the Fourth Proportional to 990.88, 1,367.76 and 659.20

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Solution

The fourth proportional to 990.88, 1,367.76 and 659.20 is: 909.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.88 : 1,367.76 = 659.20 : x
  2. Step 2: Convert to fraction form
    990.88/1,367.76 = 659.20/x
  3. Step 3: Cross multiply
    990.88x = 1,367.76 × 659.20
  4. Step 4: Simplify right side
    990.88x = 901,627.39
  5. Step 5: Solve for x
    x = 901,627.39/990.88
  6. Step 6: Final answer
    x = 909.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.