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Finding the Fourth Proportional to 988.92, 1,483.40 and 258.50

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Solution

The fourth proportional to 988.92, 1,483.40 and 258.50 is: 387.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.92 : 1,483.40 = 258.50 : x
  2. Step 2: Convert to fraction form
    988.92/1,483.40 = 258.50/x
  3. Step 3: Cross multiply
    988.92x = 1,483.40 × 258.50
  4. Step 4: Simplify right side
    988.92x = 383,458.90
  5. Step 5: Solve for x
    x = 383,458.90/988.92
  6. Step 6: Final answer
    x = 387.75

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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.