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Finding the Fourth Proportional to 989.78, 1,484.36 and 404.78

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Solution

The fourth proportional to 989.78, 1,484.36 and 404.78 is: 607.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.78 : 1,484.36 = 404.78 : x
  2. Step 2: Convert to fraction form
    989.78/1,484.36 = 404.78/x
  3. Step 3: Cross multiply
    989.78x = 1,484.36 × 404.78
  4. Step 4: Simplify right side
    989.78x = 600,839.24
  5. Step 5: Solve for x
    x = 600,839.24/989.78
  6. Step 6: Final answer
    x = 607.04

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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.