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Finding the Fourth Proportional to 990, 1,485.57 and 404.91

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Solution

The fourth proportional to 990, 1,485.57 and 404.91 is: 607.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    990 : 1,485.57 = 404.91 : x
  2. Step 2: Convert to fraction form
    990/1,485.57 = 404.91/x
  3. Step 3: Cross multiply
    990x = 1,485.57 × 404.91
  4. Step 4: Simplify right side
    990x = 601,522.15
  5. Step 5: Solve for x
    x = 601,522.15/990
  6. Step 6: Final answer
    x = 607.60

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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.