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Finding the Fourth Proportional to 98.02, 135.28 and 56.58

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Solution

The fourth proportional to 98.02, 135.28 and 56.58 is: 78.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.02 : 135.28 = 56.58 : x
  2. Step 2: Convert to fraction form
    98.02/135.28 = 56.58/x
  3. Step 3: Cross multiply
    98.02x = 135.28 × 56.58
  4. Step 4: Simplify right side
    98.02x = 7,654.14
  5. Step 5: Solve for x
    x = 7,654.14/98.02
  6. Step 6: Final answer
    x = 78.09

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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.