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Finding the Fourth Proportional to 653.48, 980.12 and 392.64

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Solution

The fourth proportional to 653.48, 980.12 and 392.64 is: 588.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.48 : 980.12 = 392.64 : x
  2. Step 2: Convert to fraction form
    653.48/980.12 = 392.64/x
  3. Step 3: Cross multiply
    653.48x = 980.12 × 392.64
  4. Step 4: Simplify right side
    653.48x = 384,834.32
  5. Step 5: Solve for x
    x = 384,834.32/653.48
  6. Step 6: Final answer
    x = 588.90

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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.