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Finding the Fourth Proportional to 979.53, 1,352.03 and 684.89

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Solution

The fourth proportional to 979.53, 1,352.03 and 684.89 is: 945.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.53 : 1,352.03 = 684.89 : x
  2. Step 2: Convert to fraction form
    979.53/1,352.03 = 684.89/x
  3. Step 3: Cross multiply
    979.53x = 1,352.03 × 684.89
  4. Step 4: Simplify right side
    979.53x = 925,991.83
  5. Step 5: Solve for x
    x = 925,991.83/979.53
  6. Step 6: Final answer
    x = 945.34

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1.5x scale

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.