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Finding the Fourth Proportional to 983.42, 1,356.93 and 634.58

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Solution

The fourth proportional to 983.42, 1,356.93 and 634.58 is: 875.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.42 : 1,356.93 = 634.58 : x
  2. Step 2: Convert to fraction form
    983.42/1,356.93 = 634.58/x
  3. Step 3: Cross multiply
    983.42x = 1,356.93 × 634.58
  4. Step 4: Simplify right side
    983.42x = 861,080.64
  5. Step 5: Solve for x
    x = 861,080.64/983.42
  6. Step 6: Final answer
    x = 875.60

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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.