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Finding the Fourth Proportional to 98.10, 135.40 and 59.28

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Solution

The fourth proportional to 98.10, 135.40 and 59.28 is: 81.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.10 : 135.40 = 59.28 : x
  2. Step 2: Convert to fraction form
    98.10/135.40 = 59.28/x
  3. Step 3: Cross multiply
    98.10x = 135.40 × 59.28
  4. Step 4: Simplify right side
    98.10x = 8,026.51
  5. Step 5: Solve for x
    x = 8,026.51/98.10
  6. Step 6: Final answer
    x = 81.82

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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.