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Finding the Fourth Proportional to 690.56, 953.04 and 515.60

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Solution

The fourth proportional to 690.56, 953.04 and 515.60 is: 711.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.56 : 953.04 = 515.60 : x
  2. Step 2: Convert to fraction form
    690.56/953.04 = 515.60/x
  3. Step 3: Cross multiply
    690.56x = 953.04 × 515.60
  4. Step 4: Simplify right side
    690.56x = 491,387.42
  5. Step 5: Solve for x
    x = 491,387.42/690.56
  6. Step 6: Final answer
    x = 711.58

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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.