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Finding the Fourth Proportional to 690.30, 953.98 and 565.76

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Solution

The fourth proportional to 690.30, 953.98 and 565.76 is: 781.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.30 : 953.98 = 565.76 : x
  2. Step 2: Convert to fraction form
    690.30/953.98 = 565.76/x
  3. Step 3: Cross multiply
    690.30x = 953.98 × 565.76
  4. Step 4: Simplify right side
    690.30x = 539,723.72
  5. Step 5: Solve for x
    x = 539,723.72/690.30
  6. Step 6: Final answer
    x = 781.87

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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.