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Finding the Fourth Proportional to 690.38, 953.34 and 515.42

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Solution

The fourth proportional to 690.38, 953.34 and 515.42 is: 711.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.38 : 953.34 = 515.42 : x
  2. Step 2: Convert to fraction form
    690.38/953.34 = 515.42/x
  3. Step 3: Cross multiply
    690.38x = 953.34 × 515.42
  4. Step 4: Simplify right side
    690.38x = 491,370.50
  5. Step 5: Solve for x
    x = 491,370.50/690.38
  6. Step 6: Final answer
    x = 711.74

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Double scale
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1.5x scale

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.