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Finding the Fourth Proportional to 990.65, 1,484.55 and 556.89

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Solution

The fourth proportional to 990.65, 1,484.55 and 556.89 is: 834.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.65 : 1,484.55 = 556.89 : x
  2. Step 2: Convert to fraction form
    990.65/1,484.55 = 556.89/x
  3. Step 3: Cross multiply
    990.65x = 1,484.55 × 556.89
  4. Step 4: Simplify right side
    990.65x = 826,731.05
  5. Step 5: Solve for x
    x = 826,731.05/990.65
  6. Step 6: Final answer
    x = 834.53

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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.