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Finding the Fourth Proportional to 608.96, 839.80 and 515.90

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Solution

The fourth proportional to 608.96, 839.80 and 515.90 is: 711.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.96 : 839.80 = 515.90 : x
  2. Step 2: Convert to fraction form
    608.96/839.80 = 515.90/x
  3. Step 3: Cross multiply
    608.96x = 839.80 × 515.90
  4. Step 4: Simplify right side
    608.96x = 433,252.82
  5. Step 5: Solve for x
    x = 433,252.82/608.96
  6. Step 6: Final answer
    x = 711.46

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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.