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Finding the Fourth Proportional to 867.40, 1,196.58 and 645.64

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Solution

The fourth proportional to 867.40, 1,196.58 and 645.64 is: 890.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.40 : 1,196.58 = 645.64 : x
  2. Step 2: Convert to fraction form
    867.40/1,196.58 = 645.64/x
  3. Step 3: Cross multiply
    867.40x = 1,196.58 × 645.64
  4. Step 4: Simplify right side
    867.40x = 772,559.91
  5. Step 5: Solve for x
    x = 772,559.91/867.40
  6. Step 6: Final answer
    x = 890.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.