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Finding the Fourth Proportional to 708.38, 977.57 and 428.61

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Solution

The fourth proportional to 708.38, 977.57 and 428.61 is: 591.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.38 : 977.57 = 428.61 : x
  2. Step 2: Convert to fraction form
    708.38/977.57 = 428.61/x
  3. Step 3: Cross multiply
    708.38x = 977.57 × 428.61
  4. Step 4: Simplify right side
    708.38x = 418,996.28
  5. Step 5: Solve for x
    x = 418,996.28/708.38
  6. Step 6: Final answer
    x = 591.49

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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.