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Finding the Fourth Proportional to 808.94, 1,212.68 and 322.32

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Solution

The fourth proportional to 808.94, 1,212.68 and 322.32 is: 483.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.94 : 1,212.68 = 322.32 : x
  2. Step 2: Convert to fraction form
    808.94/1,212.68 = 322.32/x
  3. Step 3: Cross multiply
    808.94x = 1,212.68 × 322.32
  4. Step 4: Simplify right side
    808.94x = 390,869.41
  5. Step 5: Solve for x
    x = 390,869.41/808.94
  6. Step 6: Final answer
    x = 483.19

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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.