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Finding the Fourth Proportional to 292.39, 438.36 and 148.21

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Solution

The fourth proportional to 292.39, 438.36 and 148.21 is: 222.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.39 : 438.36 = 148.21 : x
  2. Step 2: Convert to fraction form
    292.39/438.36 = 148.21/x
  3. Step 3: Cross multiply
    292.39x = 438.36 × 148.21
  4. Step 4: Simplify right side
    292.39x = 64,969.34
  5. Step 5: Solve for x
    x = 64,969.34/292.39
  6. Step 6: Final answer
    x = 222.20

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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.