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Finding the Fourth Proportional to 456.45, 630.20 and 407.25

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Solution

The fourth proportional to 456.45, 630.20 and 407.25 is: 562.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.45 : 630.20 = 407.25 : x
  2. Step 2: Convert to fraction form
    456.45/630.20 = 407.25/x
  3. Step 3: Cross multiply
    456.45x = 630.20 × 407.25
  4. Step 4: Simplify right side
    456.45x = 256,645.29
  5. Step 5: Solve for x
    x = 256,645.29/456.45
  6. Step 6: Final answer
    x = 562.26

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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.