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Finding the Fourth Proportional to 312.64, 468.75 and 139.21

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Solution

The fourth proportional to 312.64, 468.75 and 139.21 is: 208.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.64 : 468.75 = 139.21 : x
  2. Step 2: Convert to fraction form
    312.64/468.75 = 139.21/x
  3. Step 3: Cross multiply
    312.64x = 468.75 × 139.21
  4. Step 4: Simplify right side
    312.64x = 65,254.69
  5. Step 5: Solve for x
    x = 65,254.69/312.64
  6. Step 6: Final answer
    x = 208.72

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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.