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Finding the Fourth Proportional to 807.81, 1,210.53 and 788.64

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Solution

The fourth proportional to 807.81, 1,210.53 and 788.64 is: 1,181.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.81 : 1,210.53 = 788.64 : x
  2. Step 2: Convert to fraction form
    807.81/1,210.53 = 788.64/x
  3. Step 3: Cross multiply
    807.81x = 1,210.53 × 788.64
  4. Step 4: Simplify right side
    807.81x = 954,672.38
  5. Step 5: Solve for x
    x = 954,672.38/807.81
  6. Step 6: Final answer
    x = 1,181.80

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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.