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Finding the Fourth Proportional to 633.30, 874.35 and 485.65

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Solution

The fourth proportional to 633.30, 874.35 and 485.65 is: 670.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    633.30 : 874.35 = 485.65 : x
  2. Step 2: Convert to fraction form
    633.30/874.35 = 485.65/x
  3. Step 3: Cross multiply
    633.30x = 874.35 × 485.65
  4. Step 4: Simplify right side
    633.30x = 424,621.28
  5. Step 5: Solve for x
    x = 424,621.28/633.30
  6. Step 6: Final answer
    x = 670.50

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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.