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Finding the Fourth Proportional to 558.01, 770.10 and 389.98

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Solution

The fourth proportional to 558.01, 770.10 and 389.98 is: 538.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.01 : 770.10 = 389.98 : x
  2. Step 2: Convert to fraction form
    558.01/770.10 = 389.98/x
  3. Step 3: Cross multiply
    558.01x = 770.10 × 389.98
  4. Step 4: Simplify right side
    558.01x = 300,323.60
  5. Step 5: Solve for x
    x = 300,323.60/558.01
  6. Step 6: Final answer
    x = 538.20

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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.