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Finding the Fourth Proportional to 985.14, 1,358.91 and 636.03

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Solution

The fourth proportional to 985.14, 1,358.91 and 636.03 is: 877.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.14 : 1,358.91 = 636.03 : x
  2. Step 2: Convert to fraction form
    985.14/1,358.91 = 636.03/x
  3. Step 3: Cross multiply
    985.14x = 1,358.91 × 636.03
  4. Step 4: Simplify right side
    985.14x = 864,307.53
  5. Step 5: Solve for x
    x = 864,307.53/985.14
  6. Step 6: Final answer
    x = 877.34

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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.