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Finding the Fourth Proportional to 690.89, 953.46 and 411.11

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Solution

The fourth proportional to 690.89, 953.46 and 411.11 is: 567.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.89 : 953.46 = 411.11 : x
  2. Step 2: Convert to fraction form
    690.89/953.46 = 411.11/x
  3. Step 3: Cross multiply
    690.89x = 953.46 × 411.11
  4. Step 4: Simplify right side
    690.89x = 391,970.12
  5. Step 5: Solve for x
    x = 391,970.12/690.89
  6. Step 6: Final answer
    x = 567.34

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Double scale
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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.