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Finding the Fourth Proportional to 318.78, 474.40 and 307.26

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Solution

The fourth proportional to 318.78, 474.40 and 307.26 is: 457.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.78 : 474.40 = 307.26 : x
  2. Step 2: Convert to fraction form
    318.78/474.40 = 307.26/x
  3. Step 3: Cross multiply
    318.78x = 474.40 × 307.26
  4. Step 4: Simplify right side
    318.78x = 145,764.14
  5. Step 5: Solve for x
    x = 145,764.14/318.78
  6. Step 6: Final answer
    x = 457.26

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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.