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Finding the Fourth Proportional to 108, 148.80 and 89.60

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Solution

The fourth proportional to 108, 148.80 and 89.60 is: 123.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    108 : 148.80 = 89.60 : x
  2. Step 2: Convert to fraction form
    108/148.80 = 89.60/x
  3. Step 3: Cross multiply
    108x = 148.80 × 89.60
  4. Step 4: Simplify right side
    108x = 13,332.48
  5. Step 5: Solve for x
    x = 13,332.48/108
  6. Step 6: Final answer
    x = 123.45

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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.