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Finding the Fourth Proportional to 1,014.28, 1,398.90 and 665.56

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Solution

The fourth proportional to 1,014.28, 1,398.90 and 665.56 is: 917.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,014.28 : 1,398.90 = 665.56 : x
  2. Step 2: Convert to fraction form
    1,014.28/1,398.90 = 665.56/x
  3. Step 3: Cross multiply
    1,014.28x = 1,398.90 × 665.56
  4. Step 4: Simplify right side
    1,014.28x = 931,051.88
  5. Step 5: Solve for x
    x = 931,051.88/1,014.28
  6. Step 6: Final answer
    x = 917.94

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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.