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Finding the Fourth Proportional to 545.50, 752.79 and 312.76

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Solution

The fourth proportional to 545.50, 752.79 and 312.76 is: 431.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.50 : 752.79 = 312.76 : x
  2. Step 2: Convert to fraction form
    545.50/752.79 = 312.76/x
  3. Step 3: Cross multiply
    545.50x = 752.79 × 312.76
  4. Step 4: Simplify right side
    545.50x = 235,442.60
  5. Step 5: Solve for x
    x = 235,442.60/545.50
  6. Step 6: Final answer
    x = 431.61

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