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Finding the Fourth Proportional to 715.96, 1,072.35 and 613.45

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Solution

The fourth proportional to 715.96, 1,072.35 and 613.45 is: 918.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.96 : 1,072.35 = 613.45 : x
  2. Step 2: Convert to fraction form
    715.96/1,072.35 = 613.45/x
  3. Step 3: Cross multiply
    715.96x = 1,072.35 × 613.45
  4. Step 4: Simplify right side
    715.96x = 657,833.11
  5. Step 5: Solve for x
    x = 657,833.11/715.96
  6. Step 6: Final answer
    x = 918.81

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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.