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Finding the Fourth Proportional to 485.02, 728.46 and 415.76

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Solution

The fourth proportional to 485.02, 728.46 and 415.76 is: 624.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.02 : 728.46 = 415.76 : x
  2. Step 2: Convert to fraction form
    485.02/728.46 = 415.76/x
  3. Step 3: Cross multiply
    485.02x = 728.46 × 415.76
  4. Step 4: Simplify right side
    485.02x = 302,864.53
  5. Step 5: Solve for x
    x = 302,864.53/485.02
  6. Step 6: Final answer
    x = 624.44

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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.