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Finding the Fourth Proportional to 509.77, 703.14 and 428.74

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Solution

The fourth proportional to 509.77, 703.14 and 428.74 is: 591.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.77 : 703.14 = 428.74 : x
  2. Step 2: Convert to fraction form
    509.77/703.14 = 428.74/x
  3. Step 3: Cross multiply
    509.77x = 703.14 × 428.74
  4. Step 4: Simplify right side
    509.77x = 301,467.85
  5. Step 5: Solve for x
    x = 301,467.85/509.77
  6. Step 6: Final answer
    x = 591.38

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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.