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Finding the Fourth Proportional to 653.42, 979.65 and 214.53

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Solution

The fourth proportional to 653.42, 979.65 and 214.53 is: 321.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.42 : 979.65 = 214.53 : x
  2. Step 2: Convert to fraction form
    653.42/979.65 = 214.53/x
  3. Step 3: Cross multiply
    653.42x = 979.65 × 214.53
  4. Step 4: Simplify right side
    653.42x = 210,164.31
  5. Step 5: Solve for x
    x = 210,164.31/653.42
  6. Step 6: Final answer
    x = 321.64

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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.