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Finding the Fourth Proportional to 978.14, 1,349.82 and 558.56

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Solution

The fourth proportional to 978.14, 1,349.82 and 558.56 is: 770.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.14 : 1,349.82 = 558.56 : x
  2. Step 2: Convert to fraction form
    978.14/1,349.82 = 558.56/x
  3. Step 3: Cross multiply
    978.14x = 1,349.82 × 558.56
  4. Step 4: Simplify right side
    978.14x = 753,955.46
  5. Step 5: Solve for x
    x = 753,955.46/978.14
  6. Step 6: Final answer
    x = 770.81

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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.