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Finding the Fourth Proportional to 628.23, 867.53 and 407.56

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Solution

The fourth proportional to 628.23, 867.53 and 407.56 is: 562.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.23 : 867.53 = 407.56 : x
  2. Step 2: Convert to fraction form
    628.23/867.53 = 407.56/x
  3. Step 3: Cross multiply
    628.23x = 867.53 × 407.56
  4. Step 4: Simplify right side
    628.23x = 353,570.53
  5. Step 5: Solve for x
    x = 353,570.53/628.23
  6. Step 6: Final answer
    x = 562.80

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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.