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Finding the Fourth Proportional to 478.12, 717.17 and 131.45

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Solution

The fourth proportional to 478.12, 717.17 and 131.45 is: 197.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.12 : 717.17 = 131.45 : x
  2. Step 2: Convert to fraction form
    478.12/717.17 = 131.45/x
  3. Step 3: Cross multiply
    478.12x = 717.17 × 131.45
  4. Step 4: Simplify right side
    478.12x = 94,271.84
  5. Step 5: Solve for x
    x = 94,271.84/478.12
  6. Step 6: Final answer
    x = 197.17

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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.