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Finding the Fourth Proportional to 628.08, 942.12 and 457.20

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Solution

The fourth proportional to 628.08, 942.12 and 457.20 is: 685.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.08 : 942.12 = 457.20 : x
  2. Step 2: Convert to fraction form
    628.08/942.12 = 457.20/x
  3. Step 3: Cross multiply
    628.08x = 942.12 × 457.20
  4. Step 4: Simplify right side
    628.08x = 430,737.26
  5. Step 5: Solve for x
    x = 430,737.26/628.08
  6. Step 6: Final answer
    x = 685.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.