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Finding the Fourth Proportional to 690.58, 958.74 and 670.53

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Solution

The fourth proportional to 690.58, 958.74 and 670.53 is: 930.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.58 : 958.74 = 670.53 : x
  2. Step 2: Convert to fraction form
    690.58/958.74 = 670.53/x
  3. Step 3: Cross multiply
    690.58x = 958.74 × 670.53
  4. Step 4: Simplify right side
    690.58x = 642,863.93
  5. Step 5: Solve for x
    x = 642,863.93/690.58
  6. Step 6: Final answer
    x = 930.90

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.