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Finding the Fourth Proportional to 643.27, 957.56 and 613.45

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Solution

The fourth proportional to 643.27, 957.56 and 613.45 is: 913.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.27 : 957.56 = 613.45 : x
  2. Step 2: Convert to fraction form
    643.27/957.56 = 613.45/x
  3. Step 3: Cross multiply
    643.27x = 957.56 × 613.45
  4. Step 4: Simplify right side
    643.27x = 587,415.18
  5. Step 5: Solve for x
    x = 587,415.18/643.27
  6. Step 6: Final answer
    x = 913.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.