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Finding the Fourth Proportional to 136.40, 204.64 and 64.20

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Solution

The fourth proportional to 136.40, 204.64 and 64.20 is: 96.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.40 : 204.64 = 64.20 : x
  2. Step 2: Convert to fraction form
    136.40/204.64 = 64.20/x
  3. Step 3: Cross multiply
    136.40x = 204.64 × 64.20
  4. Step 4: Simplify right side
    136.40x = 13,137.89
  5. Step 5: Solve for x
    x = 13,137.89/136.40
  6. Step 6: Final answer
    x = 96.32

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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.