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Finding the Fourth Proportional to 312.51, 468.64 and 147.98

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Solution

The fourth proportional to 312.51, 468.64 and 147.98 is: 221.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.51 : 468.64 = 147.98 : x
  2. Step 2: Convert to fraction form
    312.51/468.64 = 147.98/x
  3. Step 3: Cross multiply
    312.51x = 468.64 × 147.98
  4. Step 4: Simplify right side
    312.51x = 69,347.24
  5. Step 5: Solve for x
    x = 69,347.24/312.51
  6. Step 6: Final answer
    x = 221.91

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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.