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Finding the Fourth Proportional to 985.27, 1,358.31 and 670.06

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Solution

The fourth proportional to 985.27, 1,358.31 and 670.06 is: 923.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.27 : 1,358.31 = 670.06 : x
  2. Step 2: Convert to fraction form
    985.27/1,358.31 = 670.06/x
  3. Step 3: Cross multiply
    985.27x = 1,358.31 × 670.06
  4. Step 4: Simplify right side
    985.27x = 910,149.20
  5. Step 5: Solve for x
    x = 910,149.20/985.27
  6. Step 6: Final answer
    x = 923.76

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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.