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Finding the Fourth Proportional to 555.64, 764.88 and 408.04

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Solution

The fourth proportional to 555.64, 764.88 and 408.04 is: 561.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.64 : 764.88 = 408.04 : x
  2. Step 2: Convert to fraction form
    555.64/764.88 = 408.04/x
  3. Step 3: Cross multiply
    555.64x = 764.88 × 408.04
  4. Step 4: Simplify right side
    555.64x = 312,101.64
  5. Step 5: Solve for x
    x = 312,101.64/555.64
  6. Step 6: Final answer
    x = 561.70

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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.