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Finding the Fourth Proportional to 711.14, 1,064.67 and 642.80

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Solution

The fourth proportional to 711.14, 1,064.67 and 642.80 is: 962.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.14 : 1,064.67 = 642.80 : x
  2. Step 2: Convert to fraction form
    711.14/1,064.67 = 642.80/x
  3. Step 3: Cross multiply
    711.14x = 1,064.67 × 642.80
  4. Step 4: Simplify right side
    711.14x = 684,369.88
  5. Step 5: Solve for x
    x = 684,369.88/711.14
  6. Step 6: Final answer
    x = 962.36

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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.