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Finding the Fourth Proportional to 486.72, 662.40 and 482.40

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Solution

The fourth proportional to 486.72, 662.40 and 482.40 is: 656.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.72 : 662.40 = 482.40 : x
  2. Step 2: Convert to fraction form
    486.72/662.40 = 482.40/x
  3. Step 3: Cross multiply
    486.72x = 662.40 × 482.40
  4. Step 4: Simplify right side
    486.72x = 319,541.76
  5. Step 5: Solve for x
    x = 319,541.76/486.72
  6. Step 6: Final answer
    x = 656.52

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.