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Finding the Fourth Proportional to 690.21, 952.11 and 571.71

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Solution

The fourth proportional to 690.21, 952.11 and 571.71 is: 788.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.21 : 952.11 = 571.71 : x
  2. Step 2: Convert to fraction form
    690.21/952.11 = 571.71/x
  3. Step 3: Cross multiply
    690.21x = 952.11 × 571.71
  4. Step 4: Simplify right side
    690.21x = 544,330.81
  5. Step 5: Solve for x
    x = 544,330.81/690.21
  6. Step 6: Final answer
    x = 788.65

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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.