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Finding the Fourth Proportional to 988.26, 1,479.87 and 554.91

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Solution

The fourth proportional to 988.26, 1,479.87 and 554.91 is: 830.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.26 : 1,479.87 = 554.91 : x
  2. Step 2: Convert to fraction form
    988.26/1,479.87 = 554.91/x
  3. Step 3: Cross multiply
    988.26x = 1,479.87 × 554.91
  4. Step 4: Simplify right side
    988.26x = 821,194.66
  5. Step 5: Solve for x
    x = 821,194.66/988.26
  6. Step 6: Final answer
    x = 830.95

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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.