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Finding the Fourth Proportional to 645.48, 888.57 and 479.16

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Solution

The fourth proportional to 645.48, 888.57 and 479.16 is: 659.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.48 : 888.57 = 479.16 : x
  2. Step 2: Convert to fraction form
    645.48/888.57 = 479.16/x
  3. Step 3: Cross multiply
    645.48x = 888.57 × 479.16
  4. Step 4: Simplify right side
    645.48x = 425,767.20
  5. Step 5: Solve for x
    x = 425,767.20/645.48
  6. Step 6: Final answer
    x = 659.61

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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.