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Finding the Fourth Proportional to 708.14, 976.98 and 428.45

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Solution

The fourth proportional to 708.14, 976.98 and 428.45 is: 591.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.14 : 976.98 = 428.45 : x
  2. Step 2: Convert to fraction form
    708.14/976.98 = 428.45/x
  3. Step 3: Cross multiply
    708.14x = 976.98 × 428.45
  4. Step 4: Simplify right side
    708.14x = 418,587.08
  5. Step 5: Solve for x
    x = 418,587.08/708.14
  6. Step 6: Final answer
    x = 591.11

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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.