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Finding the Fourth Proportional to 988.42, 1,363.60 and 634.26

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Solution

The fourth proportional to 988.42, 1,363.60 and 634.26 is: 875.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.42 : 1,363.60 = 634.26 : x
  2. Step 2: Convert to fraction form
    988.42/1,363.60 = 634.26/x
  3. Step 3: Cross multiply
    988.42x = 1,363.60 × 634.26
  4. Step 4: Simplify right side
    988.42x = 864,876.94
  5. Step 5: Solve for x
    x = 864,876.94/988.42
  6. Step 6: Final answer
    x = 875.01

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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.