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Finding the Fourth Proportional to 608.72, 912 and 505.40

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Solution

The fourth proportional to 608.72, 912 and 505.40 is: 757.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.72 : 912 = 505.40 : x
  2. Step 2: Convert to fraction form
    608.72/912 = 505.40/x
  3. Step 3: Cross multiply
    608.72x = 912 × 505.40
  4. Step 4: Simplify right side
    608.72x = 460,924.80
  5. Step 5: Solve for x
    x = 460,924.80/608.72
  6. Step 6: Final answer
    x = 757.20

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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.