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Finding the Fourth Proportional to 455.22, 628.16 and 307.40

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Solution

The fourth proportional to 455.22, 628.16 and 307.40 is: 424.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.22 : 628.16 = 307.40 : x
  2. Step 2: Convert to fraction form
    455.22/628.16 = 307.40/x
  3. Step 3: Cross multiply
    455.22x = 628.16 × 307.40
  4. Step 4: Simplify right side
    455.22x = 193,091.71
  5. Step 5: Solve for x
    x = 193,091.71/455.22
  6. Step 6: Final answer
    x = 424.17

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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.