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Finding the Fourth Proportional to 711.84, 1,065.46 and 644.48

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Solution

The fourth proportional to 711.84, 1,065.46 and 644.48 is: 964.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.84 : 1,065.46 = 644.48 : x
  2. Step 2: Convert to fraction form
    711.84/1,065.46 = 644.48/x
  3. Step 3: Cross multiply
    711.84x = 1,065.46 × 644.48
  4. Step 4: Simplify right side
    711.84x = 686,667.66
  5. Step 5: Solve for x
    x = 686,667.66/711.84
  6. Step 6: Final answer
    x = 964.64

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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.