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Finding the Fourth Proportional to 983.36, 1,356.80 and 633.98

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Solution

The fourth proportional to 983.36, 1,356.80 and 633.98 is: 874.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.36 : 1,356.80 = 633.98 : x
  2. Step 2: Convert to fraction form
    983.36/1,356.80 = 633.98/x
  3. Step 3: Cross multiply
    983.36x = 1,356.80 × 633.98
  4. Step 4: Simplify right side
    983.36x = 860,184.06
  5. Step 5: Solve for x
    x = 860,184.06/983.36
  6. Step 6: Final answer
    x = 874.74

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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.