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Finding the Fourth Proportional to 653.66, 979.47 and 379.88

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Solution

The fourth proportional to 653.66, 979.47 and 379.88 is: 569.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.66 : 979.47 = 379.88 : x
  2. Step 2: Convert to fraction form
    653.66/979.47 = 379.88/x
  3. Step 3: Cross multiply
    653.66x = 979.47 × 379.88
  4. Step 4: Simplify right side
    653.66x = 372,076.17
  5. Step 5: Solve for x
    x = 372,076.17/653.66
  6. Step 6: Final answer
    x = 569.22

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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.