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Finding the Fourth Proportional to 558.18, 770.29 and 390.38

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Solution

The fourth proportional to 558.18, 770.29 and 390.38 is: 538.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.18 : 770.29 = 390.38 : x
  2. Step 2: Convert to fraction form
    558.18/770.29 = 390.38/x
  3. Step 3: Cross multiply
    558.18x = 770.29 × 390.38
  4. Step 4: Simplify right side
    558.18x = 300,700.98
  5. Step 5: Solve for x
    x = 300,700.98/558.18
  6. Step 6: Final answer
    x = 538.72

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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.