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Finding the Fourth Proportional to 98.09, 135.36 and 56.64

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Solution

The fourth proportional to 98.09, 135.36 and 56.64 is: 78.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.09 : 135.36 = 56.64 : x
  2. Step 2: Convert to fraction form
    98.09/135.36 = 56.64/x
  3. Step 3: Cross multiply
    98.09x = 135.36 × 56.64
  4. Step 4: Simplify right side
    98.09x = 7,666.89
  5. Step 5: Solve for x
    x = 7,666.89/98.09
  6. Step 6: Final answer
    x = 78.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.