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Finding the Fourth Proportional to 478.30, 717.55 and 170.15

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Solution

The fourth proportional to 478.30, 717.55 and 170.15 is: 255.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.30 : 717.55 = 170.15 : x
  2. Step 2: Convert to fraction form
    478.30/717.55 = 170.15/x
  3. Step 3: Cross multiply
    478.30x = 717.55 × 170.15
  4. Step 4: Simplify right side
    478.30x = 122,088.83
  5. Step 5: Solve for x
    x = 122,088.83/478.30
  6. Step 6: Final answer
    x = 255.26

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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.