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Finding the Fourth Proportional to 807.70, 1,210.20 and 691.60

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Solution

The fourth proportional to 807.70, 1,210.20 and 691.60 is: 1,036.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.70 : 1,210.20 = 691.60 : x
  2. Step 2: Convert to fraction form
    807.70/1,210.20 = 691.60/x
  3. Step 3: Cross multiply
    807.70x = 1,210.20 × 691.60
  4. Step 4: Simplify right side
    807.70x = 836,974.32
  5. Step 5: Solve for x
    x = 836,974.32/807.70
  6. Step 6: Final answer
    x = 1,036.24

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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.