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Finding the Fourth Proportional to 558.40, 769.50 and 469.66

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Solution

The fourth proportional to 558.40, 769.50 and 469.66 is: 647.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.40 : 769.50 = 469.66 : x
  2. Step 2: Convert to fraction form
    558.40/769.50 = 469.66/x
  3. Step 3: Cross multiply
    558.40x = 769.50 × 469.66
  4. Step 4: Simplify right side
    558.40x = 361,403.37
  5. Step 5: Solve for x
    x = 361,403.37/558.40
  6. Step 6: Final answer
    x = 647.21

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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.