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Finding the Fourth Proportional to 690.80, 952.90 and 454.78

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Solution

The fourth proportional to 690.80, 952.90 and 454.78 is: 627.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.80 : 952.90 = 454.78 : x
  2. Step 2: Convert to fraction form
    690.80/952.90 = 454.78/x
  3. Step 3: Cross multiply
    690.80x = 952.90 × 454.78
  4. Step 4: Simplify right side
    690.80x = 433,359.92
  5. Step 5: Solve for x
    x = 433,359.92/690.80
  6. Step 6: Final answer
    x = 627.34

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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.