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Finding the Fourth Proportional to 977.86, 1,349.38 and 558.16

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Solution

The fourth proportional to 977.86, 1,349.38 and 558.16 is: 770.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.86 : 1,349.38 = 558.16 : x
  2. Step 2: Convert to fraction form
    977.86/1,349.38 = 558.16/x
  3. Step 3: Cross multiply
    977.86x = 1,349.38 × 558.16
  4. Step 4: Simplify right side
    977.86x = 753,169.94
  5. Step 5: Solve for x
    x = 753,169.94/977.86
  6. Step 6: Final answer
    x = 770.22

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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.