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Finding the Fourth Proportional to 1,004.46, 1,386.28 and 631.46

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Solution

The fourth proportional to 1,004.46, 1,386.28 and 631.46 is: 871.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.46 : 1,386.28 = 631.46 : x
  2. Step 2: Convert to fraction form
    1,004.46/1,386.28 = 631.46/x
  3. Step 3: Cross multiply
    1,004.46x = 1,386.28 × 631.46
  4. Step 4: Simplify right side
    1,004.46x = 875,380.37
  5. Step 5: Solve for x
    x = 875,380.37/1,004.46
  6. Step 6: Final answer
    x = 871.49

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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.