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Finding the Fourth Proportional to 608.16, 912.55 and 261.40

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Solution

The fourth proportional to 608.16, 912.55 and 261.40 is: 392.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.16 : 912.55 = 261.40 : x
  2. Step 2: Convert to fraction form
    608.16/912.55 = 261.40/x
  3. Step 3: Cross multiply
    608.16x = 912.55 × 261.40
  4. Step 4: Simplify right side
    608.16x = 238,540.57
  5. Step 5: Solve for x
    x = 238,540.57/608.16
  6. Step 6: Final answer
    x = 392.23

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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.