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Finding the Fourth Proportional to 478.47, 717.74 and 185.99

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Solution

The fourth proportional to 478.47, 717.74 and 185.99 is: 279.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.47 : 717.74 = 185.99 : x
  2. Step 2: Convert to fraction form
    478.47/717.74 = 185.99/x
  3. Step 3: Cross multiply
    478.47x = 717.74 × 185.99
  4. Step 4: Simplify right side
    478.47x = 133,492.37
  5. Step 5: Solve for x
    x = 133,492.37/478.47
  6. Step 6: Final answer
    x = 279.00

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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.