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Finding the Fourth Proportional to 708.20, 977.34 and 428.38

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Solution

The fourth proportional to 708.20, 977.34 and 428.38 is: 591.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.20 : 977.34 = 428.38 : x
  2. Step 2: Convert to fraction form
    708.20/977.34 = 428.38/x
  3. Step 3: Cross multiply
    708.20x = 977.34 × 428.38
  4. Step 4: Simplify right side
    708.20x = 418,677.57
  5. Step 5: Solve for x
    x = 418,677.57/708.20
  6. Step 6: Final answer
    x = 591.19

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1.5x scale

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.