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Finding the Fourth Proportional to 989.40, 1,484.15 and 258.98

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Solution

The fourth proportional to 989.40, 1,484.15 and 258.98 is: 388.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.40 : 1,484.15 = 258.98 : x
  2. Step 2: Convert to fraction form
    989.40/1,484.15 = 258.98/x
  3. Step 3: Cross multiply
    989.40x = 1,484.15 × 258.98
  4. Step 4: Simplify right side
    989.40x = 384,356.45
  5. Step 5: Solve for x
    x = 384,356.45/989.40
  6. Step 6: Final answer
    x = 388.47

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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.