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Finding the Fourth Proportional to 456.55, 630.58 and 345.78

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Solution

The fourth proportional to 456.55, 630.58 and 345.78 is: 477.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.55 : 630.58 = 345.78 : x
  2. Step 2: Convert to fraction form
    456.55/630.58 = 345.78/x
  3. Step 3: Cross multiply
    456.55x = 630.58 × 345.78
  4. Step 4: Simplify right side
    456.55x = 218,041.95
  5. Step 5: Solve for x
    x = 218,041.95/456.55
  6. Step 6: Final answer
    x = 477.59

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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.