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Finding the Fourth Proportional to 956.81, 1,320.40 and 709.31

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Solution

The fourth proportional to 956.81, 1,320.40 and 709.31 is: 978.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.81 : 1,320.40 = 709.31 : x
  2. Step 2: Convert to fraction form
    956.81/1,320.40 = 709.31/x
  3. Step 3: Cross multiply
    956.81x = 1,320.40 × 709.31
  4. Step 4: Simplify right side
    956.81x = 936,569.68
  5. Step 5: Solve for x
    x = 936,569.68/956.81
  6. Step 6: Final answer
    x = 978.84

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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.