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Finding the Fourth Proportional to 708.61, 977.81 and 428.74

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Solution

The fourth proportional to 708.61, 977.81 and 428.74 is: 591.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.61 : 977.81 = 428.74 : x
  2. Step 2: Convert to fraction form
    708.61/977.81 = 428.74/x
  3. Step 3: Cross multiply
    708.61x = 977.81 × 428.74
  4. Step 4: Simplify right side
    708.61x = 419,228.98
  5. Step 5: Solve for x
    x = 419,228.98/708.61
  6. Step 6: Final answer
    x = 591.62

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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.