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Finding the Fourth Proportional to 807.32, 1,210.20 and 513.92

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Solution

The fourth proportional to 807.32, 1,210.20 and 513.92 is: 770.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.32 : 1,210.20 = 513.92 : x
  2. Step 2: Convert to fraction form
    807.32/1,210.20 = 513.92/x
  3. Step 3: Cross multiply
    807.32x = 1,210.20 × 513.92
  4. Step 4: Simplify right side
    807.32x = 621,939.93
  5. Step 5: Solve for x
    x = 621,939.93/807.32
  6. Step 6: Final answer
    x = 770.38

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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.