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Finding the Fourth Proportional to 989.19, 1,484.78 and 495.95

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Solution

The fourth proportional to 989.19, 1,484.78 and 495.95 is: 744.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.19 : 1,484.78 = 495.95 : x
  2. Step 2: Convert to fraction form
    989.19/1,484.78 = 495.95/x
  3. Step 3: Cross multiply
    989.19x = 1,484.78 × 495.95
  4. Step 4: Simplify right side
    989.19x = 736,374.49
  5. Step 5: Solve for x
    x = 736,374.49/989.19
  6. Step 6: Final answer
    x = 744.42

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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.