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Finding the Fourth Proportional to 993, 1,489.50 and 385

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Solution

The fourth proportional to 993, 1,489.50 and 385 is: 577.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    993 : 1,489.50 = 385 : x
  2. Step 2: Convert to fraction form
    993/1,489.50 = 385/x
  3. Step 3: Cross multiply
    993x = 1,489.50 × 385
  4. Step 4: Simplify right side
    993x = 573,457.50
  5. Step 5: Solve for x
    x = 573,457.50/993
  6. Step 6: Final answer
    x = 577.50

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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.