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Finding the Fourth Proportional to 1,314.64, 1,814.16 and 790.40

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Solution

The fourth proportional to 1,314.64, 1,814.16 and 790.40 is: 1,090.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.64 : 1,814.16 = 790.40 : x
  2. Step 2: Convert to fraction form
    1,314.64/1,814.16 = 790.40/x
  3. Step 3: Cross multiply
    1,314.64x = 1,814.16 × 790.40
  4. Step 4: Simplify right side
    1,314.64x = 1,433,912.06
  5. Step 5: Solve for x
    x = 1,433,912.06/1,314.64
  6. Step 6: Final answer
    x = 1,090.73

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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.