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Finding the Fourth Proportional to 317.90, 474 and 315.06

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Solution

The fourth proportional to 317.90, 474 and 315.06 is: 469.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.90 : 474 = 315.06 : x
  2. Step 2: Convert to fraction form
    317.90/474 = 315.06/x
  3. Step 3: Cross multiply
    317.90x = 474 × 315.06
  4. Step 4: Simplify right side
    317.90x = 149,338.44
  5. Step 5: Solve for x
    x = 149,338.44/317.90
  6. Step 6: Final answer
    x = 469.77

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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.