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Finding the Fourth Proportional to 977.77, 1,349.36 and 558.09

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Solution

The fourth proportional to 977.77, 1,349.36 and 558.09 is: 770.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.77 : 1,349.36 = 558.09 : x
  2. Step 2: Convert to fraction form
    977.77/1,349.36 = 558.09/x
  3. Step 3: Cross multiply
    977.77x = 1,349.36 × 558.09
  4. Step 4: Simplify right side
    977.77x = 753,063.62
  5. Step 5: Solve for x
    x = 753,063.62/977.77
  6. Step 6: Final answer
    x = 770.18

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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.