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Finding the Fourth Proportional to 685.76, 946.08 and 452.80

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Solution

The fourth proportional to 685.76, 946.08 and 452.80 is: 624.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.76 : 946.08 = 452.80 : x
  2. Step 2: Convert to fraction form
    685.76/946.08 = 452.80/x
  3. Step 3: Cross multiply
    685.76x = 946.08 × 452.80
  4. Step 4: Simplify right side
    685.76x = 428,385.02
  5. Step 5: Solve for x
    x = 428,385.02/685.76
  6. Step 6: Final answer
    x = 624.69

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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.