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Finding the Fourth Proportional to 989.98, 1,486.34 and 503.37

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Solution

The fourth proportional to 989.98, 1,486.34 and 503.37 is: 755.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.98 : 1,486.34 = 503.37 : x
  2. Step 2: Convert to fraction form
    989.98/1,486.34 = 503.37/x
  3. Step 3: Cross multiply
    989.98x = 1,486.34 × 503.37
  4. Step 4: Simplify right side
    989.98x = 748,178.97
  5. Step 5: Solve for x
    x = 748,178.97/989.98
  6. Step 6: Final answer
    x = 755.75

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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.