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Finding the Fourth Proportional to 964.80, 1,331.46 and 571.80

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Solution

The fourth proportional to 964.80, 1,331.46 and 571.80 is: 789.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.80 : 1,331.46 = 571.80 : x
  2. Step 2: Convert to fraction form
    964.80/1,331.46 = 571.80/x
  3. Step 3: Cross multiply
    964.80x = 1,331.46 × 571.80
  4. Step 4: Simplify right side
    964.80x = 761,328.83
  5. Step 5: Solve for x
    x = 761,328.83/964.80
  6. Step 6: Final answer
    x = 789.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.