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Finding the Fourth Proportional to 455.40, 627.66 and 307.98

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Solution

The fourth proportional to 455.40, 627.66 and 307.98 is: 424.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.40 : 627.66 = 307.98 : x
  2. Step 2: Convert to fraction form
    455.40/627.66 = 307.98/x
  3. Step 3: Cross multiply
    455.40x = 627.66 × 307.98
  4. Step 4: Simplify right side
    455.40x = 193,306.73
  5. Step 5: Solve for x
    x = 193,306.73/455.40
  6. Step 6: Final answer
    x = 424.48

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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.