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Finding the Fourth Proportional to 690.24, 953.44 and 515.28

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Solution

The fourth proportional to 690.24, 953.44 and 515.28 is: 711.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.24 : 953.44 = 515.28 : x
  2. Step 2: Convert to fraction form
    690.24/953.44 = 515.28/x
  3. Step 3: Cross multiply
    690.24x = 953.44 × 515.28
  4. Step 4: Simplify right side
    690.24x = 491,288.56
  5. Step 5: Solve for x
    x = 491,288.56/690.24
  6. Step 6: Final answer
    x = 711.76

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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.