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Finding the Fourth Proportional to 712.48, 975.32 and 690.36

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Solution

The fourth proportional to 712.48, 975.32 and 690.36 is: 945.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.48 : 975.32 = 690.36 : x
  2. Step 2: Convert to fraction form
    712.48/975.32 = 690.36/x
  3. Step 3: Cross multiply
    712.48x = 975.32 × 690.36
  4. Step 4: Simplify right side
    712.48x = 673,321.92
  5. Step 5: Solve for x
    x = 673,321.92/712.48
  6. Step 6: Final answer
    x = 945.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.