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Finding the Fourth Proportional to 478.51, 659.70 and 321.16

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Solution

The fourth proportional to 478.51, 659.70 and 321.16 is: 442.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.51 : 659.70 = 321.16 : x
  2. Step 2: Convert to fraction form
    478.51/659.70 = 321.16/x
  3. Step 3: Cross multiply
    478.51x = 659.70 × 321.16
  4. Step 4: Simplify right side
    478.51x = 211,869.25
  5. Step 5: Solve for x
    x = 211,869.25/478.51
  6. Step 6: Final answer
    x = 442.77

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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.