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Finding the Fourth Proportional to 1,014.36, 1,399.80 and 665.68

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Solution

The fourth proportional to 1,014.36, 1,399.80 and 665.68 is: 918.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,014.36 : 1,399.80 = 665.68 : x
  2. Step 2: Convert to fraction form
    1,014.36/1,399.80 = 665.68/x
  3. Step 3: Cross multiply
    1,014.36x = 1,399.80 × 665.68
  4. Step 4: Simplify right side
    1,014.36x = 931,818.86
  5. Step 5: Solve for x
    x = 931,818.86/1,014.36
  6. Step 6: Final answer
    x = 918.63

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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.