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Finding the Fourth Proportional to 505.55, 758.35 and 478.92

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Solution

The fourth proportional to 505.55, 758.35 and 478.92 is: 718.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.55 : 758.35 = 478.92 : x
  2. Step 2: Convert to fraction form
    505.55/758.35 = 478.92/x
  3. Step 3: Cross multiply
    505.55x = 758.35 × 478.92
  4. Step 4: Simplify right side
    505.55x = 363,185.46
  5. Step 5: Solve for x
    x = 363,185.46/505.55
  6. Step 6: Final answer
    x = 718.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.