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Finding the Fourth Proportional to 964.78, 1,331.45 and 571.87

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Solution

The fourth proportional to 964.78, 1,331.45 and 571.87 is: 789.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.78 : 1,331.45 = 571.87 : x
  2. Step 2: Convert to fraction form
    964.78/1,331.45 = 571.87/x
  3. Step 3: Cross multiply
    964.78x = 1,331.45 × 571.87
  4. Step 4: Simplify right side
    964.78x = 761,416.31
  5. Step 5: Solve for x
    x = 761,416.31/964.78
  6. Step 6: Final answer
    x = 789.21

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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.