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Finding the Fourth Proportional to 990.86, 1,486.65 and 503.96

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Solution

The fourth proportional to 990.86, 1,486.65 and 503.96 is: 756.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.86 : 1,486.65 = 503.96 : x
  2. Step 2: Convert to fraction form
    990.86/1,486.65 = 503.96/x
  3. Step 3: Cross multiply
    990.86x = 1,486.65 × 503.96
  4. Step 4: Simplify right side
    990.86x = 749,212.13
  5. Step 5: Solve for x
    x = 749,212.13/990.86
  6. Step 6: Final answer
    x = 756.12

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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.