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Finding the Fourth Proportional to 990.72, 1,486.08 and 624.06

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Solution

The fourth proportional to 990.72, 1,486.08 and 624.06 is: 936.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.72 : 1,486.08 = 624.06 : x
  2. Step 2: Convert to fraction form
    990.72/1,486.08 = 624.06/x
  3. Step 3: Cross multiply
    990.72x = 1,486.08 × 624.06
  4. Step 4: Simplify right side
    990.72x = 927,403.08
  5. Step 5: Solve for x
    x = 927,403.08/990.72
  6. Step 6: Final answer
    x = 936.09

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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.