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Finding the Fourth Proportional to 482.78, 665.98 and 316.93

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Solution

The fourth proportional to 482.78, 665.98 and 316.93 is: 437.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.78 : 665.98 = 316.93 : x
  2. Step 2: Convert to fraction form
    482.78/665.98 = 316.93/x
  3. Step 3: Cross multiply
    482.78x = 665.98 × 316.93
  4. Step 4: Simplify right side
    482.78x = 211,069.04
  5. Step 5: Solve for x
    x = 211,069.04/482.78
  6. Step 6: Final answer
    x = 437.20

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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.