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Finding the Fourth Proportional to 1,014.39, 1,399.68 and 621.54

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Solution

The fourth proportional to 1,014.39, 1,399.68 and 621.54 is: 857.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,014.39 : 1,399.68 = 621.54 : x
  2. Step 2: Convert to fraction form
    1,014.39/1,399.68 = 621.54/x
  3. Step 3: Cross multiply
    1,014.39x = 1,399.68 × 621.54
  4. Step 4: Simplify right side
    1,014.39x = 869,957.11
  5. Step 5: Solve for x
    x = 869,957.11/1,014.39
  6. Step 6: Final answer
    x = 857.62

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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.