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Finding the Fourth Proportional to 951.75, 1,313.46 and 690.21

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Solution

The fourth proportional to 951.75, 1,313.46 and 690.21 is: 952.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.75 : 1,313.46 = 690.21 : x
  2. Step 2: Convert to fraction form
    951.75/1,313.46 = 690.21/x
  3. Step 3: Cross multiply
    951.75x = 1,313.46 × 690.21
  4. Step 4: Simplify right side
    951.75x = 906,563.23
  5. Step 5: Solve for x
    x = 906,563.23/951.75
  6. Step 6: Final answer
    x = 952.52

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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.