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Finding the Fourth Proportional to 993.16, 1,488.70 and 407.90

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Solution

The fourth proportional to 993.16, 1,488.70 and 407.90 is: 611.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.16 : 1,488.70 = 407.90 : x
  2. Step 2: Convert to fraction form
    993.16/1,488.70 = 407.90/x
  3. Step 3: Cross multiply
    993.16x = 1,488.70 × 407.90
  4. Step 4: Simplify right side
    993.16x = 607,240.73
  5. Step 5: Solve for x
    x = 607,240.73/993.16
  6. Step 6: Final answer
    x = 611.42

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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.