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Finding the Fourth Proportional to 319.90, 476.98 and 317.06

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Solution

The fourth proportional to 319.90, 476.98 and 317.06 is: 472.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.90 : 476.98 = 317.06 : x
  2. Step 2: Convert to fraction form
    319.90/476.98 = 317.06/x
  3. Step 3: Cross multiply
    319.90x = 476.98 × 317.06
  4. Step 4: Simplify right side
    319.90x = 151,231.28
  5. Step 5: Solve for x
    x = 151,231.28/319.90
  6. Step 6: Final answer
    x = 472.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.