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Finding the Fourth Proportional to 977.72, 1,349.28 and 558.10

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Solution

The fourth proportional to 977.72, 1,349.28 and 558.10 is: 770.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.72 : 1,349.28 = 558.10 : x
  2. Step 2: Convert to fraction form
    977.72/1,349.28 = 558.10/x
  3. Step 3: Cross multiply
    977.72x = 1,349.28 × 558.10
  4. Step 4: Simplify right side
    977.72x = 753,029.79
  5. Step 5: Solve for x
    x = 753,029.79/977.72
  6. Step 6: Final answer
    x = 770.19

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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.