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Finding the Fourth Proportional to 990.11, 1,486.53 and 503.50

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Solution

The fourth proportional to 990.11, 1,486.53 and 503.50 is: 755.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.11 : 1,486.53 = 503.50 : x
  2. Step 2: Convert to fraction form
    990.11/1,486.53 = 503.50/x
  3. Step 3: Cross multiply
    990.11x = 1,486.53 × 503.50
  4. Step 4: Simplify right side
    990.11x = 748,467.86
  5. Step 5: Solve for x
    x = 748,467.86/990.11
  6. Step 6: Final answer
    x = 755.94

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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.