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Finding the Fourth Proportional to 990.74, 1,483.68 and 558.20

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Solution

The fourth proportional to 990.74, 1,483.68 and 558.20 is: 835.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.74 : 1,483.68 = 558.20 : x
  2. Step 2: Convert to fraction form
    990.74/1,483.68 = 558.20/x
  3. Step 3: Cross multiply
    990.74x = 1,483.68 × 558.20
  4. Step 4: Simplify right side
    990.74x = 828,190.18
  5. Step 5: Solve for x
    x = 828,190.18/990.74
  6. Step 6: Final answer
    x = 835.93

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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.