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Finding the Fourth Proportional to 642.11, 961.56 and 526.83

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Solution

The fourth proportional to 642.11, 961.56 and 526.83 is: 788.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.11 : 961.56 = 526.83 : x
  2. Step 2: Convert to fraction form
    642.11/961.56 = 526.83/x
  3. Step 3: Cross multiply
    642.11x = 961.56 × 526.83
  4. Step 4: Simplify right side
    642.11x = 506,578.65
  5. Step 5: Solve for x
    x = 506,578.65/642.11
  6. Step 6: Final answer
    x = 788.93

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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.