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Finding the Fourth Proportional to 985.51, 1,360.14 and 631.49

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Solution

The fourth proportional to 985.51, 1,360.14 and 631.49 is: 871.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.51 : 1,360.14 = 631.49 : x
  2. Step 2: Convert to fraction form
    985.51/1,360.14 = 631.49/x
  3. Step 3: Cross multiply
    985.51x = 1,360.14 × 631.49
  4. Step 4: Simplify right side
    985.51x = 858,913.29
  5. Step 5: Solve for x
    x = 858,913.29/985.51
  6. Step 6: Final answer
    x = 871.54

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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.