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Finding the Fourth Proportional to 816.19, 1,222.66 and 526.75

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Solution

The fourth proportional to 816.19, 1,222.66 and 526.75 is: 789.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.19 : 1,222.66 = 526.75 : x
  2. Step 2: Convert to fraction form
    816.19/1,222.66 = 526.75/x
  3. Step 3: Cross multiply
    816.19x = 1,222.66 × 526.75
  4. Step 4: Simplify right side
    816.19x = 644,036.16
  5. Step 5: Solve for x
    x = 644,036.16/816.19
  6. Step 6: Final answer
    x = 789.08

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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.