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Finding the Fourth Proportional to 988.97, 1,483.45 and 258.55

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Solution

The fourth proportional to 988.97, 1,483.45 and 258.55 is: 387.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.97 : 1,483.45 = 258.55 : x
  2. Step 2: Convert to fraction form
    988.97/1,483.45 = 258.55/x
  3. Step 3: Cross multiply
    988.97x = 1,483.45 × 258.55
  4. Step 4: Simplify right side
    988.97x = 383,541.64
  5. Step 5: Solve for x
    x = 383,541.64/988.97
  6. Step 6: Final answer
    x = 387.82

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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.