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Finding the Fourth Proportional to 977.73, 1,349.28 and 558.09

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Solution

The fourth proportional to 977.73, 1,349.28 and 558.09 is: 770.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.73 : 1,349.28 = 558.09 : x
  2. Step 2: Convert to fraction form
    977.73/1,349.28 = 558.09/x
  3. Step 3: Cross multiply
    977.73x = 1,349.28 × 558.09
  4. Step 4: Simplify right side
    977.73x = 753,019.68
  5. Step 5: Solve for x
    x = 753,019.68/977.73
  6. Step 6: Final answer
    x = 770.17

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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.