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Finding the Fourth Proportional to 708.69, 977.57 and 428.76

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Solution

The fourth proportional to 708.69, 977.57 and 428.76 is: 591.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.69 : 977.57 = 428.76 : x
  2. Step 2: Convert to fraction form
    708.69/977.57 = 428.76/x
  3. Step 3: Cross multiply
    708.69x = 977.57 × 428.76
  4. Step 4: Simplify right side
    708.69x = 419,140.77
  5. Step 5: Solve for x
    x = 419,140.77/708.69
  6. Step 6: Final answer
    x = 591.43

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Double scale
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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.