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Finding the Fourth Proportional to 988.55, 1,363.81 and 634.68

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Solution

The fourth proportional to 988.55, 1,363.81 and 634.68 is: 875.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.55 : 1,363.81 = 634.68 : x
  2. Step 2: Convert to fraction form
    988.55/1,363.81 = 634.68/x
  3. Step 3: Cross multiply
    988.55x = 1,363.81 × 634.68
  4. Step 4: Simplify right side
    988.55x = 865,581.34
  5. Step 5: Solve for x
    x = 865,581.34/988.55
  6. Step 6: Final answer
    x = 875.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.