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Finding the Fourth Proportional to 628.68, 867.90 and 472.16

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Solution

The fourth proportional to 628.68, 867.90 and 472.16 is: 651.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.68 : 867.90 = 472.16 : x
  2. Step 2: Convert to fraction form
    628.68/867.90 = 472.16/x
  3. Step 3: Cross multiply
    628.68x = 867.90 × 472.16
  4. Step 4: Simplify right side
    628.68x = 409,787.66
  5. Step 5: Solve for x
    x = 409,787.66/628.68
  6. Step 6: Final answer
    x = 651.82

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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.