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Finding the Fourth Proportional to 983.40, 1,357.26 and 634.28

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Solution

The fourth proportional to 983.40, 1,357.26 and 634.28 is: 875.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.40 : 1,357.26 = 634.28 : x
  2. Step 2: Convert to fraction form
    983.40/1,357.26 = 634.28/x
  3. Step 3: Cross multiply
    983.40x = 1,357.26 × 634.28
  4. Step 4: Simplify right side
    983.40x = 860,882.87
  5. Step 5: Solve for x
    x = 860,882.87/983.40
  6. Step 6: Final answer
    x = 875.41

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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.