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Finding the Fourth Proportional to 690.88, 953.12 and 494.68

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Solution

The fourth proportional to 690.88, 953.12 and 494.68 is: 682.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.88 : 953.12 = 494.68 : x
  2. Step 2: Convert to fraction form
    690.88/953.12 = 494.68/x
  3. Step 3: Cross multiply
    690.88x = 953.12 × 494.68
  4. Step 4: Simplify right side
    690.88x = 471,489.40
  5. Step 5: Solve for x
    x = 471,489.40/690.88
  6. Step 6: Final answer
    x = 682.45

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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.