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Finding the Fourth Proportional to 991.46, 1,486.95 and 638.99

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Solution

The fourth proportional to 991.46, 1,486.95 and 638.99 is: 958.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.46 : 1,486.95 = 638.99 : x
  2. Step 2: Convert to fraction form
    991.46/1,486.95 = 638.99/x
  3. Step 3: Cross multiply
    991.46x = 1,486.95 × 638.99
  4. Step 4: Simplify right side
    991.46x = 950,138.75
  5. Step 5: Solve for x
    x = 950,138.75/991.46
  6. Step 6: Final answer
    x = 958.33

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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.