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Finding the Fourth Proportional to 690.84, 954 and 641.70

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Solution

The fourth proportional to 690.84, 954 and 641.70 is: 886.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.84 : 954 = 641.70 : x
  2. Step 2: Convert to fraction form
    690.84/954 = 641.70/x
  3. Step 3: Cross multiply
    690.84x = 954 × 641.70
  4. Step 4: Simplify right side
    690.84x = 612,181.80
  5. Step 5: Solve for x
    x = 612,181.80/690.84
  6. Step 6: Final answer
    x = 886.14

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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.