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Finding the Fourth Proportional to 807.45, 1,213.20 and 718.35

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Solution

The fourth proportional to 807.45, 1,213.20 and 718.35 is: 1,079.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.45 : 1,213.20 = 718.35 : x
  2. Step 2: Convert to fraction form
    807.45/1,213.20 = 718.35/x
  3. Step 3: Cross multiply
    807.45x = 1,213.20 × 718.35
  4. Step 4: Simplify right side
    807.45x = 871,502.22
  5. Step 5: Solve for x
    x = 871,502.22/807.45
  6. Step 6: Final answer
    x = 1,079.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.