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Finding the Fourth Proportional to 715.19, 1,072.79 and 440.45

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Solution

The fourth proportional to 715.19, 1,072.79 and 440.45 is: 660.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.19 : 1,072.79 = 440.45 : x
  2. Step 2: Convert to fraction form
    715.19/1,072.79 = 440.45/x
  3. Step 3: Cross multiply
    715.19x = 1,072.79 × 440.45
  4. Step 4: Simplify right side
    715.19x = 472,510.36
  5. Step 5: Solve for x
    x = 472,510.36/715.19
  6. Step 6: Final answer
    x = 660.68

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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.