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Finding the Fourth Proportional to 964.81, 1,331.13 and 571.76

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Solution

The fourth proportional to 964.81, 1,331.13 and 571.76 is: 788.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.81 : 1,331.13 = 571.76 : x
  2. Step 2: Convert to fraction form
    964.81/1,331.13 = 571.76/x
  3. Step 3: Cross multiply
    964.81x = 1,331.13 × 571.76
  4. Step 4: Simplify right side
    964.81x = 761,086.89
  5. Step 5: Solve for x
    x = 761,086.89/964.81
  6. Step 6: Final answer
    x = 788.85

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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.