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Finding the Fourth Proportional to 690.81, 953.42 and 428.91

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Solution

The fourth proportional to 690.81, 953.42 and 428.91 is: 591.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.81 : 953.42 = 428.91 : x
  2. Step 2: Convert to fraction form
    690.81/953.42 = 428.91/x
  3. Step 3: Cross multiply
    690.81x = 953.42 × 428.91
  4. Step 4: Simplify right side
    690.81x = 408,929.23
  5. Step 5: Solve for x
    x = 408,929.23/690.81
  6. Step 6: Final answer
    x = 591.96

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.