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Finding the Fourth Proportional to 88.02, 121.37 and 56.90

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Solution

The fourth proportional to 88.02, 121.37 and 56.90 is: 78.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.02 : 121.37 = 56.90 : x
  2. Step 2: Convert to fraction form
    88.02/121.37 = 56.90/x
  3. Step 3: Cross multiply
    88.02x = 121.37 × 56.90
  4. Step 4: Simplify right side
    88.02x = 6,905.97
  5. Step 5: Solve for x
    x = 6,905.97/88.02
  6. Step 6: Final answer
    x = 78.46

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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.