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Finding the Fourth Proportional to 557.77, 839.63 and 428.49

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Solution

The fourth proportional to 557.77, 839.63 and 428.49 is: 645.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.77 : 839.63 = 428.49 : x
  2. Step 2: Convert to fraction form
    557.77/839.63 = 428.49/x
  3. Step 3: Cross multiply
    557.77x = 839.63 × 428.49
  4. Step 4: Simplify right side
    557.77x = 359,773.06
  5. Step 5: Solve for x
    x = 359,773.06/557.77
  6. Step 6: Final answer
    x = 645.02

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.