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Finding the Fourth Proportional to 315.78, 472.74 and 313.38

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Solution

The fourth proportional to 315.78, 472.74 and 313.38 is: 469.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.78 : 472.74 = 313.38 : x
  2. Step 2: Convert to fraction form
    315.78/472.74 = 313.38/x
  3. Step 3: Cross multiply
    315.78x = 472.74 × 313.38
  4. Step 4: Simplify right side
    315.78x = 148,147.26
  5. Step 5: Solve for x
    x = 148,147.26/315.78
  6. Step 6: Final answer
    x = 469.15

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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.